Thon Multiflex 4U Backlid

Multiflex is excelent quality rack but I can't understand how engineers could develloped such a bad lock here. You can open backlid just by simple pressing from the bottom side so while carring this rack you can't put it on the road otherwise everything from inside ends up on the street. Historical roads of Prague are not very flat, so the rocks on the road accidentally press the lock, it accidentally open and everything you are carring in this rack, ends up on the street.