Travel bags, laptop bags, and backpacks. Tom Bihn has been designing and making bags since 1972. The best materials and innovative construction.
Horizontal Brain Cell - Tom Bihn Knitting Bags and Accessories
    Tom Bihn bags are proudly made in the USA

    Horizontal Brain Cell




    For the interior and exterior dimensions of each size of Horizontal Brain Cell, click here.


    You can expect your TOM BIHN bag to give you years of hard service. Our bags are guaranteed to be free from defects in materials and workmanship for the life of the bag. That means if something goes wrong and it's our fault, we'll fix it at no charge.

    Same with your Skookum Dog gear: it'll give you years of hard service and is guaranteed to be free of defects in materials or workmanship. If something goes wrong and it's our fault, we'll fix it at no charge. If your dog chews something up or otherwise damages it, we'll repair it for a reasonable fee if it is repairable.
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    420d HT nylon Classic Parapack
    Heavy-duty stretch mesh pockets
    Aplix® hook and loop closure
    Plush brushed tricot interior
    .375" / 10 mm open-cell foam padding in sling
    .25" / 6 mm closed-cell foam padding on sides
    .5" / 12 mm memory foam padding on bottom
    Corrugated polypropylene front, back, and bottom


    Made in USA
    100% finished seams


    For the interior and exterior dimensions of each size of Horizontal Brain Cell, click here.

    Horizontal Brain Cell

    A corrugated plastic shell, suspension system, soft foam padding and memory foam work together to protect your laptop.

    The Horizontal Brain Cell, like the Vertical Brain Cell, provides superior hard-sided protection for your laptop. It's available specific sizes designed for Apple laptops and multiple sizes designed to fit a wide variety of PC laptops. Use our Laptop Bag Fit Guide that lists the internal and external dimensions of each size of Brain Cell to determine which size of Brain Cell is the best fit for your laptop.

    Inside the Horizontal Brain Cell, your laptop hangs suspended and cradled in a sling of 10 mm (3/8") thick soft foam padding inside a 4 mm hard corrugated-plastic shell that protects from the front, back, and bottom.

    Below the padded sling, fixed to the bottom of the corrugated-plastic shell, is a 12 mm thick strip of memory foam (manufactured to our specifications in the USA). The memory foam acts as an extra layer of cushion as well as an effective shock absorber. The sides of the Horizontal Brain Cell are protected by 6 mm (1/4") of dense cross-linked closed-cell polyethylene foam. The case closes on the top, like a cereal box, with two padded flaps that seal with Aplix® strips (like Velcro®, only longer-lasting). You can shield your laptop even further: the Brain Cell is designed to clip securely inside our briefcases (Empire Builder, Zephyr), backpacks (Brain Bag, Smart Alec), travel bags (Western Flyer, Tri-Star), and messenger bags (Super Ego, Ego, ID), turning them into protective laptop bags. Note that not all sizes of Brain Cell fit inside all bags. Click here for a guide that lists which Brain Cell sizes fit in which bags.

    The Brain Cell is available in sizes designed specifically for Apple laptops (Size 4Z = 15" MacBook Pro, Size 6X = 13" MacBook Air, Size 6Z = 13" MacBook Pro, Size 1 = 17" MacBook Pro) and PC laptops (please consult our Laptop Bag Fit Guide to determine the best size for your PC laptop).

    The front of the Brain Cell has two open-top pockets made of heavy-weight stretch mesh designed to fit your power supply and other cables.

    Strong webbing handles on the top allow you to carry the Brain Cell on its own or give you a good grip as you pull it out of your larger bag. However, you can carry the Brain Cell on your shoulder. On either side of the Brain Cell are triangle D rings to which you can clip your choice of the Absolute, Standard, or Simple Shoulder Strap. Each of the triangle D ring shoulder strap attachment points is reinforced with six rows of stitching for added security. You can also likely clip a shoulder strap not made by us to the triangle D rings, but make sure the snaphooks of your shoulder strap are as durable and strong as ours; some aren't, and that could mean the protection the Brain Cell offers your laptop could, unfortunately very suddenly, come in quite handy.

    Note that in order to take full advantage of the Horizontal Brain Cell's suspension system, it must be carried in the horizontal, or "landscape," format. The laptop protection the Brain Cell provides is significantly decreased if you use the Horizontal Brain Cell vertically. If you require a protective laptop case to use in a vertical, or "portrait," format, take a look at our Vertical Brain Cell.