tldr; The original brain. Weird pockets that somehow work. Tom Bihn's gateway drug.
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Best praise vs top criticism for Tom Bihn Synapse 25
“for the love of everything, no matter what features you add please include at least 1 external water bottle pocket. i dont understand why so many bag companies just dont include it anymore and i would definitely have purchased many more bags if they had this simple feature. EDIT: another feature i just thought of: idk the word for it but when you fill up one compartment and it like stretches out so other pockets are unusable. dont do that. good example of a bag that does not do this is the tom bihn synik/synapse, all the pockets are always functional no matter how much you pack them out”
“This. For some reason the TB Synik doesn't feel great to carry whereas my GR1 fits me like a glove. My Bihn Synapse fits really well too. Likewise my aeronaut 'big' travel bag is super comfy in backpack mode, whereas I hated carrying the hyper-adjustable tortuga outbreaker. It's weird how very minor adjustments lead to major fit issues.”
780 Reddit opinions analyzed • Last updated 2/24/2026