Bike Seat Bag, Bicycle Saddle Bag Under Seat Waterproof Wedge Packs Storage Repair Kit Tools Gear with LED Taillight for Mountain Road Bicycles

The pouch is great and very durable. The description is accurate for size and functionality. I'm a little concerned about the outer mexh pocket since my seat post isn't extended very highr (I have shorter legs and a longer torso, so my seat is lower). Putting too much weight in the outer pocket could cause it to rub against my rear tire. Also, without any weight in the pockets the rear light points downward, not straight back. This might be due to the design of my bike, I'm not sure.The velcro straps are extremely strong; there are two to fit under the saddle and two to fit around the post. The pouch itself holds quite a lot and I can easily fit a tube and some extra allen keys and a small wrench in there. Again, due to my seat post being lower I don't plan to put very much weight in here. It's very lightweight as a product and I don't notice it at all when I ride. I have not tested the water resistance, but it's been rainy in Colorado so I might have opportunity to test that out soon.I'm very happy with my purchase.

I recently got a bike and decided I needed a bag like this to carry a water bottle and my phone primarily. There are many different kinds of these bags I went with this one because I needed a small, water-resistant bag. It comes with a red light which is a nice bonus. The water bottle compartment fits a regular water bottle no problem. The inside is quite roomy and you could probably fit another water bottle in it. There's a pocket on the inside, I thought it would be nice for my phone, but it turns out the iphone x was slightly too big for it, to be fair I do have a case on the phone. So far I'm happy with this bag and would recommend it.

Great seat bag, I got this for my GT mtn bike and it fits nice. I like that I can carry extra water in it with the pouch.The LED taillight works good also.This bag hold all my tools and a spare tube nicely.