This was to replace the 35l white version that was my old faithful for long weekend motorcycle touring. Saves faffing with panniers etc. I managed to burn a hole in the other one as it slipped from the seat and rubbed against my rear tyre. Lucky really that nothing more serious occurred. Anyway, this is slightly larger but a lot lighter in material - not as sturdy as the white version. That being said, it is completely waterproof and has been thoroughly tested in a soggy Belgium! easy to use and plenty of good quality fastenings.