I've had this out for several hundred miles now, some of that in cold, wet conditions. It has held up fine so far. It is big enough to hold a spare tube, levers, co2 and patch kit with no problem. I think I could get another cartridge in there if needed. Looks good and stays put! Just what I needed! (I replaced another, higher end bag that did not attach to the seat post since It was always coming loose.)
I planned to ride a century but didn't want to depend on rest stop food offerings (certain foods just don't settle after mile 50). I stuffed my jersey pockets but looked like a deflated Michelin Man. So I ignored Rule 31 and purchased this European Man Satchel. It's big, swallowed everything I dared dump in it, but cinches up nicely and is barely visible under my Selle Italia Flite.
Of course any seat bag is an abomination. But this one is a useful abomination. And my Jersey mainted it's sleek, aero, Ero-pro look (or at least what was possible given the body it was draped over). What more could you want?
On first opening the box, my reaction was this bag is too small to even hold a tube- just ship it back. But with a little patience I worked in a tube, tire irons, a CO2 cartridge and an allen wrench set in the size small bag. So the bag is big enough for what you need to change a flat or make minor repairs on the road, anything else put in the jersey pockets- that's what they are there for.
I needed a new seatbag that could hold roadbiking essential and this works great. It holds a spare tube, a patch kit, an inflator, a few CO2 cartridges and a compact too. Plus it's reflective and has a loop on it to hold a blinking rear light for dusk rides.
perfect size if you get the medium. fits a spare tube, tire levers, co2 applicator/canister, emergency spoke kit, tire boot, patch kit, multi-tool AND a pocket knife. you'll be the most prepared cat on the road-plus it looks great at night.
I got the small bag and can fit 1 tube, CO2 cannister, CO2 Inflator, small multitool, tiny patch kit, and thin business card holder I use to carry my cash, local trail pass, a credit cardhealth ID card. Tight fit, but now my jersey pockets are free for smart phone, foodgels, spare CO2 cannister or second tube for long rides, or room for clothes I peel off during colder rides. It's slightly smaller than a bag I used before. Well made and has a good shape to it. There is no inner compartments to divide things, but it does have a small clasp on a tether to secure a key.
I use this on my road bike and mtn bike, though i'ts a little too small for mtn biking because the larger inner tube barely fits. The reflective piping is good. The two interior side pockets are worthless and just take up space. They do not close, and they are open sideways toward the rear of the bag, so stuff can easily fall out when you open the bag - I don't see the point in having them. The loop at the back is okay, though my clip light has fallen off several times when going over bumps. There is a 5 inch or so strap with a clip inside the for car fobkeys - but this is sort of a useless feature - I feel they are trying too hard to add bells and whistles by including the key strap and interior pockets. The velcro strap is very secure but somewhat difficult to take off and on to switch to another bike. I may yet cut out the interior pockets and key strap to make it more functional.