M-Wave Waterproof Bike Seat Bag for Cycling - Durable Bicycle Storage Pouch for Tools, Phone & Essentials - Perfect for Road Bikes, Mountain Biking & Commuting

SOLID: This bag attaches solidly with the quick clip and single velcro band. Very snug. No wobble or sway which is common with all velcro (which will eventually loosen no matter how tight you get it).SPACIOUS: And it is spacious. I can get a slime tube, tools (levers, Topeak AlienII), extra work light (I often ride after dark, commuting), and sunglasses/wallet/phone. That is BEFORE I open up the expansion zipper. So there is room to spare. This is by far the best design of bags I have seen. Easy to get at things too. And despite its spaciousness, it is absolutely and completely out of the way under the saddle. There are also a few stretchy bands underneath to attach a few more things; but I am not sure what I would want to attach there. Maybe a small pump, but I have one on the frame (6" Zefal). It also has a reflective strip on it which is a nice touch.GREAT VALUE: And the price is so good too, a great, great value. You can pay a lot more for a much inferior bag by quality and design.CONS: I have nothing bad to say about this bag. I could not be happier with it. The ONLY thing I could think of that might be nice is if there was some kind of way to easily attach my rear blinky led lights to it (3 led Planet Bike) so it was up a little higher and visible than at the bottom of my seat post (below the bag)... I'll have to figure something out...