What do you do call it when an edgy, fashion-conscious company like Chrome makes a hip pack with integrated belt? You sure as heck don't call it a fanny pack. You call it a Shank.
Overcompensating? Maybe. Hipsters' tastes change rapidly. It may be okay to call it a fanny back -- this week.
Whatever you call it, it's a waterproof, narrow profile thing you wear around your waist.
When you're not carrying enough to justify your bike backpack or messenger bag, the Shank can still hold enough of your essentials to get you by.
Carry a rolled up t-shirt, sunglasses, flat repair kit, cell phone and some tools with room to spare. Includes a u-lock holster.