ROCKBROS Bike Seat Bag, Waterproof 0.6L Bike Seat Bag Frame Bag, Lightweight Bike Saddele Bag Top Tube Bag, Bike Accessories for Mountain MTB Road Foldable Bikes

Great bag, very well designed with a stiff plastic insert that helps keep its shape. I've been looking for a bag like this for a long time. I'm the kind of rider who likes to have a bike kit with EVERYTHING I could possibly need - but I don't like to ride with a bike bag that is too big and bulky. The zipper seems very sturdy (only time will tell) and even has a little "hood" that you can push the zipper up into when it is fully closed - presumably to keep the zipper protected to avoid water intrusion. My only complaint (and it's minor) is that to fully utilize this bag, and fill it, you really need to remove it from the bike to get things packed in properly. Once unzipped, things will fall out - which is fine - but to get everything organized in the bag it really needs to be taken off the bike. Fortunately, it's easy to get on and off because of the velcro straps.

Love this bag so much, I bought a second one for my new bike

They are easily taken off, so the security is not good. The sizes what it is. Not too big not too small. Quality is good. Ease of installation is good however it can be ripped off very easily too. Storage capacity is not so great not sure what you put in it. Because it doesn’t even fit cell phone.

No complaints. It's lighter than the Lezyne bag that I had been using. It lacks the separate compartments of the Lezyne, but I can still fit everything in. It's also pretty steady when rolling along, because of its close attachment/proximity to the seatpost.

This is a basic cycling tool bag that just works. I was concerned that the velcro straps would loosen during a ride, but after 47 miles on gravel, the straps stayed secure. The bag is big enough -- I stowed a tube, 2x 16 oz CO2 cartridges, an inflator, multi-tool, and a patch kit with room to spare. you will need to trim the velcro straps around the seat post, but a scissors is all you need.

I’ve decent quality and holds a patch repair kit

Nice design and the shape allows for some flexibility in where to mount it, but it's deceivingly soft while I expected a hard shell case. Once you've put some weight in it (multi-tool, air pump, allen wrenches) it sags into a sack & bulges where it doesn't sag. The material is also quite thin, not necessarily good for longevity. If these characteristics don't bother you then it's a very nice bag for its flexibility, shape and volume.

I've had a lot of bike bags in my day but this Rockbro's bike bag is amazing. I've got a Scott Addict E- Ride and the fit is perfect. Since I tend to ride in a rural area in which I live in I'm always looking for products that can accommodate if I get a flat and riding a bike with disc brakes is no easy picnic if you get a flat. To give you an example I can fit the CycPlus electric air pump. The big one not the small one with a spare tube a couple of levers and a multi-function tool. Everything else I carry in the jersey pocket. Phone, wallet, keys. Once I upgrade to a tubeless tire I'm sure my load will drop. What I also like is the extra velco straps you can strap around your seat post and bag so there is very little movement if I'm tossing the bike back and forth up hill. The only downside is they don't make this particular product in other colors but if they did I'd be picking up that bag and swiping right. Ride on my friends!