I've got a US10 that I've been using as a tailbag for over a year now. It has been absolutely great! Completely waterproof. And I mean completely! For its small size it will hold quite a bit. I've had a pair of rain pants, Icon Patrol gauntlet gloves, a point and shoot camera, a bottle of water, and a Garmin hiking GPS in mine. That is about all it could hold, but it all fit! If, and when the need arises, I will not hesitate to buy another Kriega product!