28-02-17, 01:24 AM
I use the Aldi ones (Clarke, I think), I think they are 50 litre and are about £11 each, totally waterproof, roll top with a buckle fastener, carrying strap and handle. I can fit my 4 man tent, double air bed and 2 sleeping bags in one. They will also carry so much beer that you have to get on the bike and have someone heave it onto the back and pass the strap over your head. Ive got 4 of them. Brilliant, never leak, no breakages or splits so far (about 3 years now), no need to buy anything else.