I don't normally recommend Tigerz11 stuff, but here is a link

http://www.tigerz11.com.au/adventure...f-top-bag.html

I bought one from them - not this exact one, but very similar, and although it has only been used a few times, it is still as good as new. As it was fairly cheap I wasn't expecting too much, and it was a little bit of a trial to put in front of my Rooftop tent, and the plan was to get a better one if it worked OK .. Think it will last me 10 years plus as is ....