Review on Waterproof Bike Triangle Bag by ROCKBROS - Under Top Tube Bicycle Frame Bag for Convenient Cycling Accessories Storage by Johnathan Sherman

The bag was very easy to fit, even on my fat tire bike frame, and is big enough to fit my 35" Kryptonite Evolution Mini built-in chain lock with 10 -mm chain convenient to store lock, a pair of gloves and some other small items. It is definitely /not/waterproof. It may have limited water resistance, but I wouldn't count on it if you're looking to keep something dry. EDIT: After six months of use, the right-hand zipper blew up and one of the bottom seams came undone completely. I would not recommend this bag. Stars updated to reflect them.