We've bought an Edinburgh Bike Co-op copy of a Yak Bob trailer. It's about half the price of a real one, and we had a 20% off voucher so even better. It comes with a waterproof bag - or at any rate it's made out of waterproof-looking fabric but isn't seam-sealed. With the Summer weather we've been having, I'm thinking I'd like to do this, rather than arrive at the campsite and change out of my wet cycling kit into my...other wet clothes. What does anyone recommend ? Someone's suggested I get a tube of silicone bathroom sealant.