This is the second one I've purchased. As I stated above, the top tube pack is light, well made, and stylish. It functions very well at the other end of the top tube fastened to the seat post. The only consideration to be aware of is if there is not much space between the headset and the stem you may have a hard time attaching the front strap as it is wide and positioned in the center.
Perfectly watertight for well more than my needs, and the Medium has plenty of space for tube, multi tool, tire levers, patch kit, a blood sugar test kit and glucose tablets for this diabetic. If you arent carrying the diabetes stuff, a packable jacket can be crammed in there.
Riding paved and packed gravel trials with the grand kids and needed a user friendly seat bag. On the rebound from trying seat bags from the big O, T, T2, B and LG. If you are not afraid of Velcro straps and or zippers to access your stuff this is the bag to try. Narrow and tall means it fits under a 140mm wide saddle and clears your legs too. Construction is good for this price range and zipper works fine so far. Will see how it holds up since Axiom appears to be the new kid on the block. Really appreciate the lack of internal stiffeners which means irregular shapes of, spare tube, multi tool, patch kit, phone, etc. fit without doing a tetras exercise. Will see if the waterproof coating is for real soon enough. Recommended. With easy installation and access to contents as standard.