I like it because itï¿½s very small. But just know that itï¿½s very small. I have a small bottle of Stanï¿½s, a co2 with a co2 regulator, some quick links and valve replacements, and my mini tool with pretty much every gadget I need on a ride in it. Itï¿½s a tight fit, but it fits. No rattling.
I can fit 5 Clif Blok sticks.
I can fit a 700c tube, a CO2 cartridge, an inflator head, some Park glueless patches, and a tire lever.
I could use it on my roadie because it comes with straps too.
As far as top tube bags go, its sleek, uncluttered design looks cooler on my bike than a few I tried at REI.