Also, you should get a backpack designed with motorcycle riding in mind-not just for the internal layout, but for the exterior design, where small details like straps, belts, buckles, etc designed to avoid tank scratches and so on.
Ogio has some really nice backpacks like the Mach series. They don't have tons of straps so there's no irritating bunches of loose straps flapping in the wind, and has inner shoes compartments as the designers know riders often use riding boots, but may need shoes for work, etc. I have tons of backpacks, and certainly didn't need another, but when you get one designed for motorcycles and touring rides, for example, the little details make a huge difference. I am a big fan of Icon and Alpinestars stuff. Icon has some nice backpacks too and their shoulder straps lead into a front vest like closure system in lieu of a belt, which can be a nuisance while riding or as you know, wreak havoc on your gas tank. The Icon tanks also come in High Viz colors with reflective strips which is a nice safety feature. RS Taichi, another favorite gear brand of mine, has a nice waterproof backpack with tons of room.
The fun part is searching for the backpack and finding one for your needs. I've spent hours looking at gloves, boots, jackets, protection armor, etc. Did the same thing for my motorcycle backpack. I had to sit there and look at specs, consider the pros and cons, etc. Took me hours to finally decide on one. There are a ton of awesome backpacks predicated for motorcycle riding. Hey, it's a legitimate excuse to shop! Trust me, you'll be psyched you got one.
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