12 of 13 customers found this review helpful.
I searched long and hard to find a partial frame bag, looking up dimensions, making paper templates to see how this or that bag would fit on my bike and how it would impede access to water bottles.
I ended up choosing this one because it had the largest volume while seeming to fit well enough on my bike and it has fit the bill, so to speak.
The only caveat is that I had to install it backwards to avoid interference with my downtube water bottle.
If you have a level top tube road frame, I would expect anything 54cm and up would fit this bag as intended. Sloping top tubes make things more difficult, but I suspect a 56cm frame with sloping top tube would fit OK. My 54cm sloping top tube needed the backwards mounting, plus lowering my bottle cages as low as possible to fit both a seat tube and down tube cage. I even ended up using a cage lowering adapter (home brewed with aluminum plate and lock nuts, resulting in a lower profile than the Shimano Di2 cage adapter or similar items. A side entry cage on the down tube also makes things work better.
With the bag itself, I like that it has two separate, full length, but asymmetrical width, compartments and two way zippers. I haven't had to test its water resistance so I can't offer any opinion there.
If there's one thing I would ding it for is that the faux leather covering the velcro is a bit flimsy and one piece tore on the first day of use. It doesn't impact functionality and isn't very noticeable, but I thought it worth pointing out.
I can carry a spare tube, a bunch of tools, patch kit, micro pump, wallet, keys, a few snacks, all with no leg interference.
Thank you for your feedback.