A Synapse 25 in Cloud (light grey) 525 Ballistic. A Synapse 25 in Cloud (light grey) 525 Ballistic with Seafoam (pale green with white grid) 200 Halcyon interior. A Synapse 25 in Cloud (light grey) 525 Ballistic with Zest (orange with white grid) 200 Halcyon interior. A Synapse 25 in Cloud (light grey) 525 Ballistic with Ultraviolet (purple with white grid) 200 Halcyon interior. The Synapse 25 in Cloud Ballistic with an Island 200 Halcyon interior. A profile shot of the Synapse 25 in Cloud (light grey) 525 Ballistic. A Synapse 25 in Deep Blue (dark blue) Ballistic. A Synapse 25 in Deep Blue (dark blue) 525 Ballistic with Moss (green with light green grid) 210 Cerylon interior. A Synapse 25 in Deep Blue (dark blue) 525 Ballistic with Zest (orange with white grid) 200 Halcyon interior. A Synapse 25 in Deep Blue (dark blue) 525 Ballistic with Cerise (pink with white grid) 200 Halcyon interior. A Synapse 25 in Deep Blue (dark blue) 525 Ballistic with Wasabi (green with white grid) 200 Halcyon interior. A Synapse 25 in Deep Blue (dark blue) 525 Ballistic with Northwest Sky (grey with light grey grid) 210 Cerylon interior. A Synapse 25 in Deep Blue (dark blue) 525 Ballistic with Acai (dark purple with white grid) 200 Halcyon interior. A Synapse 25 in Aubergine (dark purple) 525 Ballistic. A Synapse 25 in Aubergine (dark purple) Ballistic with Dusk (light blue-grey with blue-grey grid) 210 Cerylon interior. A Synapse 25 in Aubergine (purple) 525 Ballistic with Mountain Grey 210 Cerylon interior. A Synapse 25 in Aubergine (dark purple) 525 Ballistic with Island (blue with white grid) 200 Halcyon interior. A Synapse 25 in Aubergine (dark purple) 525 Ballistic with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Aubergine (dark purple) Ballistic with Tidal (pale blue with white grid) 200 Halcyon interior. A Synapse 25 in Taiga (olive green with grey grid) 400 Halcyon. A Synapse 25 in Taiga (olive green with grey grid) 400 Halcyon with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Night Walk (blue with grey grid) 400 Halcyon. A Synapse 25 in Night Walk (blue with grey grid) 400 Halcyon with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Constellation (light blue) 525 Ballistic. A Synapse 25 in Constellation (light blue) 525 Ballistic with Mountain Grey (grey with light grey grid) 210 Cerylon interior. A Synapse 25 in Constellation (light blue) 525 Ballistic with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Constellation (light blue) 525 Ballistic with Solaris (yellow with white grid) 200 Halcyon interior. A Synapse 25 in Wilderness (forest green) Ballistic. A Synapse 25 in Wilderness (forest green) 525 Ballistic with Mountain Grey (grey with light grey grid) 200 Halcyon interior. A Synapse 25 in Wilderness (forest green) 525 Ballistic with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Wilderness (forest green) Ballistic with Taiga (olive green with white grid) 200 Halcyon interior. A Synapse 25 in Wilderness (forest green) 525 Ballistic with Seafoam (pale green with white grid) 200 Halcyon interior. A Synapse 25 in Wilderness (forest green) 525 Ballistic with Coyote (brown with white grid) 200 Halcyon interior. A Synapse 25 in Black Ballistic. A Synapse 25 in Black Ballistic with Island (blue with white grid) 200 Halcyon interior. A Synapse 25 in Black Ballistic with Cerise (pink with white grid) 200 Halcyon interior. A Synapse 25 in Black Ballistic with Zest (orange with white grid) 200 Halcyon interior. A Synapse 25 in Black 525 Ballistic with Seafoam (pale green with white grid) 200 Halcyon interior. A Black Ballistic Synapse 25 with the side pocket open showing the Moss Cerylon lining color. A Synapse 25 in Black 630 Ballistic. A Synapse 25 in Black 630 Ballistic with Northwest Sky (light grey with white grid) 200 Halcyon interior. A profile shot of Synapse 25 in Black 525 Ballistic. A Synapse 25 in Mars Red Ballistic. Synapse 25 in Mars Red Ballistic with Northwest Sky Halcyon interior. Synapse 25 in Burnt Orange Ballistic A Synapse 25 in Burnt Orange 525 Ballistic with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Burnt Orange 525 Ballistic with Northwest Sky (grey with light grey grid) 210 Cerylon interior. A Synapse 25 in Nebulous Grey (medium grey) 630 Ballistic. A Nebulous Grey Ballistic Synapse 25 with the side pocket open showing the Island Halcyon lining color. A Nebulous Grey Ballistic Synapse 25 with the side pocket open showing the Marigold Cerylon lining color. A Nebulous Grey Ballistic Synapse 25 with the side pocket open showing the Sangria Cerylon lining color. A Synapse 25 in Nebulous Grey (medium grey) 525 Ballistic with Island (blue) 210 Ballistic interior. A Synapse 25 in Nebulous Grey (medium grey) 525 Ballistic with Solaris (yellow with white grid) 200 Halcyon interior. A Synapse 25 in Nebulous Grey (medium grey) 525 Ballistic with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Ursa (brown-grey) 525 Ballistic. Synapse 25 in Ursa Ballistic with a Tidal 200 Halcyon interior. A Synapse 25 in Ursa (brown-grey) Ballistic with Seafoam (pale green with white grid) 200 Halcyon interior. A Synapse 25 in Ursa (grey brown) 525 Ballistic with Northwest Sky (grey with light grey grid) 210 Cerylon interior. A Synapse 25 in Ursa (brown-grey) 525 Ballistic with Dawn (purple grey) 210 Ballistic interior. A Synapse 25 in Ursa (brown-grey) 525 Ballistic with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Ursa (brown-grey) 525 Ballistic with Island (blue with white grid) 200 Halcyon interior. Synapse 25 in Ursa Ballistic with a Moss 210 Cerylon interior. A Synapse 25 in Coyote (brown) 525 Ballistic. A Synapse 25 in Coyote (brown) 525 Ballistic with Northwest Sky (grey with light grey grid) 210 Cerylon interior. A Synapse 25 in Coyote (brown) 525 Ballistic with Northwest Sky (light grey with white grid) 200 Halcyon interior. A Synapse 25 in Coyote (brown) 525 Ballistic with Island (blue with white grid) 200 Halcyon interior. The Synapse 25 in Marine X-Pac The Synapse 25 in Marine (blue) X-Pac with a Northwest Sky (grey with white grid) 200 Halcyon interior The Synapse 25 in Black X-Pac with a colorful label The Synapse 25 in Black X-Pac with a Zest (orange with white grid) 200 Halcyon interior The Synapse 25 in Black X-Pac with a grey label The Synapse 25 in Black X-Pac with a Northwest Sky (grey with white grid) 200 Halcyon interior.
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$243.00


Color: Deep Blue Ballistic/Moss 210 Cerylon

In Stock

Available Color options

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One backpack for: Ultralight travel. Day hikes. EDC.

25 liters / 1526 cu.in.

Looking for the Synapse 19, Synik 22, or Synik 30?
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$50.00 - 10A (10.5" 2021 iPad/ iPad Air/Pro)
visible variant TB03310A TB03310B TB03311A TB03312A TB03313A TB03313B TB03313C TB03313D TB03313E TB03315A TB03315B TB03315C TB03315D TB03316A TB03317B^^A Cache on the Horizontal side.

TLDR

With 30% more volume than the Synapse 19, the Synapse 25 is an everyday backpack designed with ultimate utility in mind. 

  • Main compartment with 2 O-rings
  • Interior, banded open-top pocket
  • 5 exterior front pockets with independent volume
  • Comfortable, durable, edgeless shoulder straps
  • Breathable back panel
  • Removable sternum strap and waist strap
  • Webbing loop on exterior bottom of bag to hook items on the outside
  • Meets the personal item size requirement on most airlines
  • Generally fits folks between 5'6" and 6'6" comfortably

Full Description

 

Main Compartment

The main compartment closes with #10 YKK® Racquet-Coil zipper and is designed to fit large, flat items like notebooks. On the front interior side of the main compartment, there is a banded open-top pocket. It's spacious enough to fit a wide range of items, such as books, tablet, pair of sandals or our Clear 3D Organizer Cube. Above this open-top pocket is a set of Cache lops where you can secure a device as large as the 16" Macbook Pro in a Cache

On the back interior side of the main compartment are an additional set of Cache loops and two O-rings for tethering additional pouches.

5 Front Exterior Organizational Pockets

The Synapse 25 has an abundant amount of organization for your everyday essentials, big and small. The exterior of the bag has five pockets with independent volume, meaning that the pockets are designed and patterned in such a way that they don't steal space from each other and they look good (not too caved in, not too bulgy) whether full or empty.

The water bottle pocket is intentionally centered in the bag, allowing one of the heavier objects in your bag to be balanced in the middle, resulting in a more comfortable carrying experience while maintaining a clean, straight-forward exterior aesthetic. We've found that most standard 32 oz / 1 liter water bottles can comfortably fit in the water bottle pocket.

Below the opening for the water bottle pocket is another small zippered pocket that is just deep enough for keys, a wallet, glove liners, or a small camera.

The side pockets are generously sized for sunglasses (in a case or alone), a first aid kit, or even a light Windbreaker-type jacket or down vest compressed in a Travel Stuff Sack. The right side pocket has a small organizational pocket; the left pocket has one pen slot and two wider slots for tools or more pens. 

The bottom pocket is a great spot for extra clothing or snacks and will easily accommodate a thin sweater, light down jacket, or Windbreaker-type jacket. If you care to add organization, we recommend storing a Size 2 Handy Little Thing here. 

Each of the top four pockets has its own O-ring, and the bottom pocket has three O-rings. You can use them to attach our mini or small Ghost Whale Organizer Pouches or Mystery Organizer Pouches.

Edgeless EV50 1/2" Shoulder Strap

Conformity is overrated — except, perhaps, when it comes to shoulder straps. The edgelessness of this strap allows it to more softly conform to your shoulder; we find that this increases comfort. Yet the straps aren't too soft: the 1/2" thick foam means the strap is robust enough to carry a heavy load.

There's enough length on the shoulder straps to accommodate a wide range of body types. If you need to tighten the straps to the maximum amount, don't worry about having dangling ends — we've included sewn-in strap keepers to help keep those at bay. 

Breathable Back Panel

The back panel of the Synapse 25 is padded with 1/4", high quality, closed cell-foam with an exterior of Spacer mesh and 210 denier nylon. This combination of mesh and smooth nylon is designed to provide maximum breathability while still being gentle on your clothing.

Webbing Loop on Exterior Bottom

On the exterior bottom of the bag is a 1.5" / 38mm webbing loop. Originally, the Synapse was designed for hiking, so the intended use of the webbing loop was for hooking on a flashlight (highly recommended if you ride a bicycle or walk in the dark). If you're planning on using the Synapse for travel, we've found the webbing loop serves as an extra grab handle, allowing you to easily pull the Synapse from under the seat or the overhead compartment no matter which direction you stowed it on your flight.

What's Included

Included Removable Sternum Strap + Waist Strap

As with all of our major backpacks, we include adjustable and removable sternum and waist straps: if you don't like or don't use your waist or sternum strap, remove them!

8" Snaphook/Snaphook Key Strap

As with most of our bags, we've included a key strap. 8" long from tip-to-tip, a snaphook on either end. Good for attaching your keys to.

A Set of Black Zipper Pulls

A set of pulls to extend or replace your metal pulls.

What's Optional

Size 2 Handy Little Thing (HLT)

You can attach a Size 2 Handy Little Thing (HLT) to the pair of cache loops above the open-top pocket, or you can store the HLT in the bottom front pocket of the Synapse 25. It is the perfect clamshell organizer pouch for those looking for a lot of organization.

Packing Cube Shoulder Bag

The Packing Cube Shoulder Bag is the perfect 2-in-1 packing cube. It's big enough to store rolled up shirts. Once you reach your destination, attach a shoulder strap and use it as a crossbody. 

Freudian Slip

Love organizing and want even more pockets? The Synapse 25/Synik 30 Freudian Slip adds an additional fifteen organizational pockets to your bag. One side of the Freudian Slip has two folder pockets that can fit folders/papers horizontally or vertically, as well as four open-top pockets for a small tablet in a Cache or a notebook. The other side has two mesh pockets for bulky items, two large zippered pockets, four pen slots, and a business card slot.

Cache

The Synapse 25 can accommodate a wide range of devices. If you plan on putting a laptop or smaller tablet in the interior banded open-top pocket, we recommend adding a Cache.

The main compartment closes with #10 YKK® Racquet-Coil zipper and is designed to fit large, flat items like notebooks. On the front interior side of the main compartment, there is a banded open-top pocket. It's spacious enough to fit a wide range of items, such as books, tablet, pair of sandals or our Clear 3D Organizer Cube. Above this open-top pocket is a set of Cache lops where you can secure a device as large as the 16" Macbook Pro in a Cache

On the back interior side of the main compartment are an additional set of Cache loops and two O-rings for tethering additional pouches.

The Synapse 25 has an abundant amount of organization for your everyday essentials, big and small. The exterior of the bag has five pockets with independent volume, meaning that the pockets are designed and patterned in such a way that they don't steal space from each other and they look good (not too caved in, not too bulgy) whether full or empty.

The water bottle pocket is intentionally centered in the bag, allowing one of the heavier objects in your bag to be balanced in the middle, resulting in a more comfortable carrying experience while maintaining a clean, straight-forward exterior aesthetic. We've found that most standard 32 oz / 1 liter water bottles can comfortably fit in the water bottle pocket.

Below the opening for the water bottle pocket is another small zippered pocket that is just deep enough for keys, a wallet, glove liners, or a small camera.

The side pockets are generously sized for sunglasses (in a case or alone), a first aid kit, or even a light Windbreaker-type jacket or down vest compressed in a Travel Stuff Sack. The right side pocket has a small organizational pocket; the left pocket has one pen slot and two wider slots for tools or more pens. 

The bottom pocket is a great spot for extra clothing or snacks and will easily accommodate a thin sweater, light down jacket, or Windbreaker-type jacket. If you care to add organization, we recommend storing a Size 2 Handy Little Thing here. 

Each of the top four pockets has its own O-ring, and the bottom pocket has three O-rings. You can use them to attach our mini or small Ghost Whale Organizer Pouches or Mystery Organizer Pouches.

Conformity is overrated — except, perhaps, when it comes to shoulder straps. The edgelessness of this strap allows it to more softly conform to your shoulder; we find that this increases comfort. Yet the straps aren't too soft: the 1/2" thick foam means the strap is robust enough to carry a heavy load.

There's enough length on the shoulder straps to accommodate a wide range of body types. If you need to tighten the straps to the maximum amount, don't worry about having dangling ends — we've included sewn-in strap keepers to help keep those at bay. 

The back panel of the Synapse 25 is padded with 1/4", high quality, closed cell-foam with an exterior of Spacer mesh and 210 denier nylon. This combination of mesh and smooth nylon is designed to provide maximum breathability while still being gentle on your clothing.

On the exterior bottom of the bag is a 1.5" / 38mm webbing loop. Originally, the Synapse was designed for hiking, so the intended use of the webbing loop was for hooking on a flashlight (highly recommended if you ride a bicycle or walk in the dark). If you're planning on using the Synapse for travel, we've found the webbing loop serves as an extra grab handle, allowing you to easily pull the Synapse from under the seat or the overhead compartment no matter which direction you stowed it on your flight.

Included Removable Sternum Strap + Waist Strap

As with all of our major backpacks, we include adjustable and removable sternum and waist straps: if you don't like or don't use your waist or sternum strap, remove them!

8" Snaphook/Snaphook Key Strap

As with most of our bags, we've included a key strap. 8" long from tip-to-tip, a snaphook on either end. Good for attaching your keys to.

A Set of Black Zipper Pulls

A set of pulls to extend or replace your metal pulls.

Size 2 Handy Little Thing (HLT)

You can attach a Size 2 Handy Little Thing (HLT) to the pair of cache loops above the open-top pocket, or you can store the HLT in the bottom front pocket of the Synapse 25. It is the perfect clamshell organizer pouch for those looking for a lot of organization.

Packing Cube Shoulder Bag

The Packing Cube Shoulder Bag is the perfect 2-in-1 packing cube. It's big enough to store rolled up shirts. Once you reach your destination, attach a shoulder strap and use it as a crossbody. 

Freudian Slip

Love organizing and want even more pockets? The Synapse 25/Synik 30 Freudian Slip adds an additional fifteen organizational pockets to your bag. One side of the Freudian Slip has two folder pockets that can fit folders/papers horizontally or vertically, as well as four open-top pockets for a small tablet in a Cache or a notebook. The other side has two mesh pockets for bulky items, two large zippered pockets, four pen slots, and a business card slot.

Cache

The Synapse 25 can accommodate a wide range of devices. If you plan on putting a laptop or smaller tablet in the interior banded open-top pocket, we recommend adding a Cache.

Materials

Upper Back

Spacer Mesh

Back Pad

Closed-cell foam

Shoulder Straps

Edgeless EV50 1/2” / 12mm shoulder straps (EVAZOTE® OEKO-TEX® foam)

Zippers

1x #10 YKK Racquet-Coil water-repellent zipper with metal slider (main compartment)
5 #8 YKK Racquet-Coil water-repellent zippers with metal sliders (all other exterior zippers)

Specs

Dimensions

13.4" (w) x 20" (h) x 9.1" (d) / 340 (w) x 508 (h) x 230 (d) mm

Weight

400d Halcyon/420d nylon ripstop: 1 lb 13 oz / 822 grams
X-Pac®: 1 lb 13.1 oz / 825 grams
630d Ballistic: 1 lb 15.8 oz / 900 grams

Volume

25 liters / 1526 cubic inches (ASTM Standard Measure)

Straps

.375" / 10 mm padded and contoured backpack straps with .75" / 20 mm removable sternum strap

Total O-Rings

9

(2 in the main compartment
1 in the top center pocket
1 in the small center pocket
3 in the bottom front pocket
1 in the left side pocket
1 in the right side pocket)

4.9
Rated 4.9 out of 5 stars
Based on 273 reviews
97%would recommend this product
273 reviews
  • Nathaniel J E.
    Verified Buyer
    Bought For Myself
    Product Standouts Thoughtful Design, Sewn in USA, Versatile, Good Storage Size, High Quality Craftsmanship
    1 week ago
    Bought For Myself
    Product Standouts Thoughtful Design, Sewn in USA, Versatile, Good Storage Size, High Quality Craftsmanship
    Rated 5 out of 5 stars
    My new backpack

    I researched for months for a new backpack that suited my style and needs. This was one of my best decisions. I had a sling pack by Tom Bihn in the late nineties, that was stolen. Glad I remembered the brand name. This was an excellent purchase. Fits my coffee, water bottle, and glasses case. While the books I’m reading and notebooks in the bottom pouch, leaving the whol main compartment for jackets not needed in the later part of the day, laptop, and whatever else. Classy and simple, a great asset for my life.

  • Daniel A.
    Verified Buyer
    Bought For Myself
    Product Standouts Thoughtful Design, Comfortable, High Quality Craftsmanship, Sewn in USA, High Quality Finishings
    2 months ago
    Bought For Myself
    Product Standouts Thoughtful Design, Comfortable, High Quality Craftsmanship, Sewn in USA, High Quality Finishings
    Rated 5 out of 5 stars
    Best bag ever!

    Love my Synapse 25. Great material, awesome zippers, plenty of room. It's the bag I've been looking for!

  • Michael O.
    Verified Buyer
    Bought For Myself
    Product Standouts Comfortable, High Quality Craftsmanship, Sewn in USA, High Quality Finishings, Durable
    2 months ago
    Bought For Myself
    Product Standouts Comfortable, High Quality Craftsmanship, Sewn in USA, High Quality Finishings, Durable
    Rated 5 out of 5 stars
    The More You Use It, The More You Love It

    Thought the Synapse was a bit "dad basic" at first but I've really come to love it the more I use it. Tom Bihn really makes high-quality products, and the Synapse is super comfortable and functional! Very happy with this backpack. +

  • JC
    Verified Buyer
    Bought For Myself
    Product Standouts Thoughtful Design, High Quality Craftsmanship, Sewn in USA, High Quality Finishings, Durable
    3 months ago
    Bought For Myself
    Product Standouts Thoughtful Design, High Quality Craftsmanship, Sewn in USA, High Quality Finishings, Durable
    Rated 5 out of 5 stars
    My 3rd Synapse 25

    This is my 3rd Synapse 25. First one was stolen many years ago, had my second one since then, and this third one is just an upgrade for me that I very recently purchased. I wanted the black color and the ballistic nylon fabric. I did not like the metal zippers that would clang loudly and incessantly, so I switched them out to these paracord zippers. Tom Bihn sells these separately but I didn’t like the two colors available at the moment (too happy-lookin’), so I bought these dull green colored ones on Amazon. I already had the plastic end pieces with the Tom Bihn logo on them so I used those to close the ends off and they worked perfectly (see picture). Some videos online show people looping the paracord through the holes in the zipper pulls, which ends up extending the total length of the zipper pull, and makes the design feel more cluttered to the eye in my opinion. What I did was cut the metal zipper pulls off (was very sad and stressful to do this to such a beautifully made product) then completely replaced them with the paracord pulls. I am very happy with the reality of my vision aesthetically, and also no more clanging.

    Some things I wish were different with the bag would be a more firm/solid bottom and back side to help the bag stand up straight more. I can also sometimes feel the bag’s backside folding too much, and/or feel the items inside of it too much on my back, like poking it, or just generally feeling lumpy. Part of this supposedly improved back side would…

  • JOSHUA W.
    Verified Buyer
    Bought For Myself
    Product Standouts Comfortable, High Quality Craftsmanship, High Quality Finishings, Thoughtful Design, Durable
    3 months ago
    Bought For Myself
    Product Standouts Comfortable, High Quality Craftsmanship, High Quality Finishings, Thoughtful Design, Durable
    Rated 5 out of 5 stars
    Greatness

    I've had a Synik 30 for awhile and fell in love with the TB fit and finish immediately. It's such an amazing and comfortable pack, I had to try the smaller brother, Synapse 25. I'm just as impressed with this most recent purchase as I was with my first! The quality and comfort is just out of this world. IF you're on the fence about buying one, just do it and thank me later.

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