Got this before going on holiday to Tunisia a couple of weeks ago. Strict limit of 15kg per case to avoid extra charges. Packed the 2 cases - had put more in one than the other - inadvertently - but was reassuring to know both were below the limit. Coming home, had bought a few gifts, so it was good to be able to check the weights again. This time, we found we'd overpacked one of the cases, and spent a bit of time moving stuff from one case to the other to make sure everything was evenly distributed. Got to the airport, Monastir, and they weren't remotely interested! They seemed to be only looking at the total allowance for 2 people, it appeared from the couple who checked in before us! Anyway, some airlines (airports) will be more picky. Well worth the money.