I used the ones that are specifically hard to open (you basically force a blade into a part and if you want to remove it it is destructive). It will not protec

I used the ones that are specifically hard to open (you basically force a blade into a part and if you want to remove it it is destructive). It will not protect le against everything, and this is the reason i do not go for anything fancy. I just hope that the ones who would like to put something in would be deterred by the zips. Anything that breaks visibly (a seal for instance) would do, but this leaves traces on the suitcase.