Whatever you do, don't try storing pictures of steamrollers or very fat people on it, or you won't be able to lift it. If YOU must store heavy things, try counteracting them with photos of balloons and gliders, or recordings of light music.
not sure but if you pack it in your suitcase to go on holiday make sure its empty when you go and if you fill it up with loads of stuff while your away an holiday make sure you empty all the stuff onto your laptop before you go home as you might be over the 20kg luggage limit better to be safe than sorry innit.............