Wanting a way to transport a bike plus cycle clothing, some tools, helmet, a couple of wetsuits and other stuff than might smell if it's left in the camper for a few days, being a cheapskate I bodged this up.......box was £17 from B&Q, two wing bolts/nuts, a large jubilee clip to fasten it to the bike rack base and some gorilla tape on the inside to seal the holes. It stayed bone dry over a 6 week trip and never moved, it's not secure but if you want to steal my cycling kit all credit to you , two double bed mattress bags wrapped the bike up nice and dry too.....in total I spent £26 and consider myself a proper cheapskate