Inspired by the hydration packs we use for backcountry skiing and mountain biking, we set out to design a completely different kind of tank bag. The Nomad comes with a 2L Hydrapak reservoir, and it has tons of pockets for all those little things you used to throw in a tank bag and promptly lose. Best of all, it unclips from the bike quickly and easily, and converts to a fully functional backpack.