All-City Captain Phil Commuter Backpack: MD; White

That's a very nice backpack for the ones who ride bikes. I bought the mid-size, and there's room for a lot of things, like one week of groceries. And it's very confortable when riding, the weight is very divided along the back.

The material is waterproof, so it's ok to ride in the rain.

The only downside is the belly strap that is very thin, and don't help much.

Definitely recommend.