I got the 25L Carbon Fiber. It's the perfect size for complementing my side cases with additional storage without the top case.

With regards to the buckle issues mentioned in previous reviews, it's a misunderstanding of the system. There is a mesh bag that can be attached to the outside of the dry bag so you can pack your wet stuff outside. It has the opposite buckle of what's on the bag. In addition the bags can be stacked if you have multiple. It's a very well designed system.

25L mounted on the back of my K9 Cockpit is the perfect size and the bag in the picture is far from fully loaded. Definitely a worthwhile investment!

These bags surprised me. I tried talking myself into more expensive bags but kept coming back to these and finally ordered. I’ve had them on for close to 2000 miles now with a lot of silt commuting, a couple harder day rides, a single overnight moto camp, and a 4 night WABDR run. They have taken some serious abuse. One left side crash, pushing brush, jumps, all around hard riding. They hold exactly what I need for ultralight camping and paired with a top duffle I can pack enough for ultra comfort. The quality is incredible, they are waterproof, the buckles and cinches all work great, mounting is easy as can be, and they look great. Only problem is finding places to run straps on the bike and now my moto boots have started rubbing the straps thin. No fault of the bags more my attachment points. I’m going to add strap protectors and better frame attachments. Can’t recommend these enough!

I do a lot of kayaking and occasional caving in an area with an underground stream, and am very familiar with using this style of waterproof dry bag. If you've never used one, it might feel counterintuitive - because the bags don't actually seal at the top in a more traditional method, like a zipper. Instead, they have a strap on the top that is tightly rolled a few times before being buckled together. This style of bag has saved my camera equipment when my kayak flipped (sending the bag floating downstream on its own) and while crawling through the frigid waters of an underground stream. This OSAH 10 L dry bag feels very robust, with a PVC canvas-like material. My last one was made of a nearly identical material, and lasted for a few years, until it got a pinhole from hitting a sharp rock while caving. Even then, it hardly allowed any water to reach my equipment - so I feel comfortable recommending this very similar bag for all your outdoor adventures. The color is true to the product photography, and the included phone holder was able to fit my Samsung A16, even with the phone case attached. Speaking of the phone holder - I also had a nearly identical phone holder when flipping my kayak in some rapids, and it absolutely saved my phone (but I still wouldn't recommend it for swimming). While these experiences were with different bags, they are remarkably similar, to the extent that I trust this bag to an identical level, and won't be afraid to take it with me to extremely wet environments (though for very expensive things like camera equipment, I like to also bag them in thinner zipped bags to add an extra layer of safety). Unlike other bags I've had in the past - this one has lines on it to show you how tightly to roll the top, which can be a helpful feature. When rolled on these lines, the bag feels air-tight (or at least close to it). At the time of writing, this 10 L dry bag with the phone holder is listed at less than $20 - I wouldn't have had any regrets purchasing it for this price.