I haven't toured yet but am dialling in by bike by grocery shopping with it etc. Anyway I ripped the second velcro strap on one of my rear waterproof bags making it quite likely to bounce off. I'm sending them in for a return but wondered what I should use for a replcement? I'm using a Tubus Logo rear rack on a large frame mountain bike. I love the rack, just want new rear bags. I'm thinking of getting some ortlieb's.