This was an upgrade to my previous big bag because it was too small and was annoying to remove and put on to my bike. The replacement was worth it. Its very compact and sits perfectly on the the top tube. It is easy to put on and remove due to the permanently stitched straps on the exterior of the bag. It does not rub against my legs when peddling nor does it move when doing an intense riding. This is first for me but there is alot of space in this thing. I put a small pump ( about 10 inches in length), an inner tube, tire levers and there was still space for extra stuff. I recommend this product.

Very well designed bike bag. I have it on a Cannondale Quick. It's somewhat stiff, so it holds it's shape very well and doesn't take on the wrinkled appearance of some of the bags with thinner material. The stiffness also reduces the tendency to flop around to almost zero, which I greatly appreciate. I don't like loose or rattly components on my bikes. The straps can be tightened down quite a bit, and they don't come loose. The straps come a little long, but I just cut them down flush after I had them as tight as I wanted so there were no loose ends.
I never tested the waterproofing claim by spraying it with a hose, but on my rides during rainy days, the interior stayed dry, so it's at least water resistant. None of the seams or zipper appears to leak, even after a couple of years of use.
It's a single pocket design, but one of the nicest features is that the zipper opens up the entire side of the bag. I have other bags where the zipper only opens along the top, and you need to reach inside and dig around to find what you're looking. This bag you're able to easily see what you're looking for.
Two things I found could be improved upon. The zippers appear to be normal YKK zippers with the metal pull tab along with a small cord attached to it. I find that sometimes when my knee swipes against the side of the bag while peddling, I hear a little "clink" as the two metal pieces shift against each other. Other bags have just the metal zipper, and then a corded pull tab which eliminates that metal against metal sound. It's not loud, but can be heard every once in a while.
The other thing that can be improved is that the mounting straps cannot be moved to other locations. The straps are sewn where they are, which limits the location you can mount the bag on your bike to really only one spot.
All in all though, it's a great bag. Perfect for storing little things while riding, a multi-tool, keys, wallet, tire levers and such. It gets all the major things right and looks pretty sleek while doing so.

Nice quality I like the design that makes it fit under the center bar and not being in the way when riding I even have my water bottle underneath and it’s enough room to use. To install it is very easy and quick good straps. the zipper is good not flimsy the only thing I would have liked to see it with more compartments you can’t insert a lot of things in it. I recommend it!

Great bag and fits on my bike perfectly

Great storage tool. Am able to fit a multitool, small bike pump, patch kit, and two spare tubes inside. Easy to install onto your bike, and the Velcro works like a charm.
Zipper seems very durable and sturdy— I had this packed to the brim.
Looks very sleek and is easy to clean mud off of.
Highly recommend.

Great bag for tools and phone and it's water proof love it

Gets the job done, however, it is not waterproof from my exprience: I left it on an parking spot on a rainy day and when i came back the insides were somewhat wet. It kept some water away but calling it waterproof might be above what it can actually do.
If you expect this to keep stuff from getting wet while riding this might work as your body prevents most water to get to it.