Review on Waterproof Bike Seat Bag by ROCKBROS, 3D Shell Saddle Bag for Mountain and Road Bikes - Cycling Seat Pack Under Seat by Nathan Vaughn

The bag is not bad. It hangs for a very long time and supports all my flat gear repairs, and not just on the rides. I tie my bike to the back of my brother's jeep to get up the hill or to work and never have to worry about it. This is a good bag. I haven't had any problems with zips, velcro or waterproofing and I've ridden in bad weather. Good bag. I am the largest size. If you ride in a more upright position, consider sizing down as you might rub your feet a bit. The lower the saddle height, the smaller the size should be.