100 % polyester
H 14cm x L 28cm x W 5cm
I can't speak for durability as i only just purchased this bag but i like it in general and was what i wanted. What i didn't realise was that maybe it's designed more for off-road usage worn over nylons. I do not have a particularly large girth but with a leather jacket on and the strap extended to it's maximum length i was only able to JUST squeeze it around my waist and latch it closed. So this is something to bear in mind before making your purchase if doing so online as i did. Otherwise it's a nice bum bag.