These larger bags will naturally fit better on touring or gravel bikes, which have larger front triangles to accommodate frame bags. What type of riding will you be doing? Bikepackers or riders on extended tours will want a frame bag with a 6- to 10-liter capacity. Road-style commuter bikes or gravel bikes will usually have the widest triangles, with full-suspension mountain bikes typically requiring specifically fitted bags to accommodate for rear suspension. Larger frame bags will also reach all the way to the seatpost, creating a secure triangle usually held in place with webbing or hook-and-loop closures. You want the frame bag to fit securely between the top tube and down tube.
Some brands, like Salsa, will tell you exactly what bike each frame bag fits, and with others you’ll have to take measurements. Since this bag fits inside the triangle of your bike-and there are so many variations on these sizes-it’s critical to know every dimension of your bike frame before committing to a bag. The dimensions of a frame bag matter more than volume. Even a PU-coated nylon bag won’t be fully watertight if the zippers and/or openings aren’t built to be waterproof.
It's wise to check on whether or not a bag you're eyeing is fully waterproof before you make your purchase. Nylon bags are more flexible than their hard-sided counterparts and allow you to pack in more items, though each bag’s specifications will have different deniers for increased durability or weight savings. Most bags are built using some type of nylon, though there are also some hard-sided bags out there.
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