1 item of hand luggage rule is to blame but it's easily sorted with a few braincells, put the smaller bag with the stuff you actually need in the bigger bag, take this out before you chuck your big bag in the locker. Stick the smaller bag under your seat for take-off, job done.
Then make sure you drink at least 10 cans of lager so you need a piss every 5 minutes otherwise the miserable words removed that are your fellow passengers won't have anything to moan about on t'internet when they get home