I’ve had this for about a month now and I love it. Quality seems decent. I have a dropper so I threaded the loop through the seat itself. Now, it doesn’t get in the way of my dropper at all.
I carry a topeak tool and patches. It will fit a spare tube but I don’t have one right now. I also leave the bag on the bike when it goes on a bike rack and have gone on the freeway with no problems at all.
It’s only 0.3L so don’t expect to be fitting your lunch in there, but it’s perfect for carrying what I need in case I get a flat or need to adjust something. Perfect size for going on the seat and not interfering with the dropper in a nutshell.