• visible variant TB1812-BA^^An Aeronaut 30 or pre-2014 Aeronaut Frame Sheet.
  • visible variant TB1813-BA^^An Aeronaut 45 Frame Sheet.
  • lifestyle visible^^Inserting an Aeronaut 45 Frame Sheet into the bottom/rear pocket of the Aeronaut 45.
  • lifestyle visible^^A top-down view of inserting an Aeronaut 45 Frame Sheet into the bottom/rear pocket of the Aeronaut 45.
  • lifestyle visible ^^ A person holding open the shoulder strap pocket of the Aeronaut with the frame inside
  • lifestyle visible^^A person carrying an Aeronaut 45 as a backpack.
  • visible variant TB1812-BA^^An Aeronaut 30 or pre-2014 Aeronaut Frame Sheet.
  • visible variant TB1813-BA^^An Aeronaut 45 Frame Sheet.
  • lifestyle visible^^Inserting an Aeronaut 45 Frame Sheet into the bottom/rear pocket of the Aeronaut 45.
  • lifestyle visible^^A top-down view of inserting an Aeronaut 45 Frame Sheet into the bottom/rear pocket of the Aeronaut 45.
  • lifestyle visible ^^ A person holding open the shoulder strap pocket of the Aeronaut with the frame inside
  • lifestyle visible^^A person carrying an Aeronaut 45 as a backpack.

Aeronaut Internal Frame

$35

Ready to Ship

Optional internal frames with aluminum stays designed to work with any generation of Aeronaut 30 or 45.

What Goes Into A Tom Bihn Backpack?

Each bag is handmade in the U.S. using premium, hard-wearing materials—and built to last a lifetime, guaranteed. You're not just buying a bag, you're investing in decades of thoughtful design, durable function, and responsible craftsmanship.


Size

Size: Aeronaut 30 or pre-2014 Aeronaut 45 Internal Frame

Available Size options


Aeronaut Internal Frame

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Description

We present for your use these optional, removable internal frames with aluminum stays for the Aeronaut 30 and Aeronaut 45 travel bags.

We’ve pre-bent the stay to a generic spinal curve; if you'd like, you can re-bend and/or adjust the curvature to best fit your own back (see here for video instructions demonstrating how to do this with the Guide's Pack frames; the same method applies to the Aeronaut frames).

Please note: Aeronaut 45s made before 2014 have a slightly shorter back compartment, which means you'll need to use the Aeronaut 30 Internal Frame. If the main compartment dividers of your Aeronaut 45 are secured with snaps as opposed to zippers, you have an Aeronaut 45 made before 2014.

In doubt as to which vintage of Aeronaut you have? emailus@tombihn.com or give us a call at 1-800-729-9607 or +1-206-652-4123.

Reviews

5.0
Rated 5.0 out of 5 stars
Based on 27 reviews
Total 5 star reviews: 26 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
27 reviews
  • HH
    Hinnerk H.
    Verified Buyer
    Bought For Myself
    Product Standouts Thoughtful Design, Comfortable, Durable
    2 years ago
    Bought For Myself
    Product Standouts Thoughtful Design, Comfortable, Durable
    Rated 5 out of 5 stars
    Aeronaut 45 even fits the FILBE Assault Pack very well

    I was looking for an improved framesheet replacement for my FILBE assault packs. I wanted something with protected edges because the originals tend to eat themselves through the fabric over time and something with a support bar to have a better weight distribution.

    After checking weight, how it fits and how it feels I am very happy with my purchase. The new framesheet weighs even 13 to 15 grams lesser than the original framesheets (180 grams vs. 193/195 grams). Sizewise the new framesheet is almost the same as the originals, only ca. 3cm lesser in height (see the attached photos). The Tom Bihn framesheet has a short aluminum bar that helps forward weight to the hips. The shape and holes seem to do what Tom Bihn claims in the product description.

    Overall I can definitely recommend this Tom Bihn framesheet as an improved replacement for the FILBE assault pack.

  • A
    Aaron
    1 month ago
    Rated 5 out of 5 stars
    5 Stars

    I bought one of these to put into a frameless backpack. The size was perfect and being able to modify the stay shape is a great option. It helps make sure the pack is comfortable, regardless of what I have in it.

  • BS
    Bethany Shorey F.
    Verified Buyer
    Bought For Myself
    Product Standouts Comfortable, High Quality Craftsmanship, Durable, Thoughtful Design
    5 months ago
    Bought For Myself
    Product Standouts Comfortable, High Quality Craftsmanship, Durable, Thoughtful Design
    Rated 5 out of 5 stars
    Makes trips more comfortable

    I've had my aeronaut 45 for almost 10 years, traveled all over, and usually wear it backpack style. My only complaint is that it can be uncomfortable to haul over long distances. The internal frame definitely helps relieve some of the back and shoulder pain I've experienced!

  • S
    Sarah
    5 months ago
    Rated 5 out of 5 stars
    5 Stars

    Perfect upgrade to the older aeronaut

  • MF
    Mike F.
    Verified Buyer
    Bought For Myself
    Product Standouts Comfortable
    5 months ago
    Bought For Myself
    Product Standouts Comfortable
    Rated 5 out of 5 stars
    A blessing

    The support offered by this internal frame, for my Aeronaut 45, is subtle, but makes a huge difference when carting around a fully loaded pack between the airport and accommodations.

Quality Designs Since 1972

Designed with obsessive attention to detail, we pride ourselves in offering bags in unmatched quality and durability—whether you're commuting, traveling, or navigating daily life. Built to endure, made to move with you.

The BIHN Guarantee

We stand behind every bag we make. If it’s our fault, we’ll fix it—no questions asked. For everything else, we offer honest repairs in our Seattle factory.