ROCKBROS Bike Seat Bag Waterproof Bicycle Saddle Bag 0.6L Bike Frame Bag | Lightweight Bike Bag Under Seat, Bicycle Top Tube Bag, Cycling Seat Pack, Bike Accessories For Mountain Road Foldable Bikes

A great quality option for wanting to try and keep things aerodynamic. Size is decent - I can fit a spare tube, tire levers, bike tool and CO2 cartridges. The velcro attachment pieces I found were not ideal as they rub on the inside of my ribs causing premature wear, I replaced with some wire ties and that solved my problem.

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.

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.

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!

Enough room for tools.