have any lads got a backpack from wcw with a faulty pump, have they fixed it for you or does the waranty not cover this, whats stopping you from banging it accidently on ground and knocking the pump., is the trolley system a better sturdier buy in the long run., a bit more expensive but will last. im in two minds what to do yet, keep putting it off. never buy a second hand one unless pick up and test it, goy backpack from ebay said 6 months old, great i thought still new, arrived tried it leaked all in base, took cover off pump spraying water everywhere.even on terminals. freezing weather breaks pumps. he said it must have happened in transport. sent back through ebay. still out of pocket had to pay for postage back. tired finger. that one was bright orange paul, too bright illuminous.