From the rehearsal room into the van, from the van out on a cold and wet loading dock, from the loading dock through the narrow and dusty corridors at the venue, and then - after the gig - take down everything and leave it in a room overnight before you can load everything in the van to drive home again. Who knows what can happen on the way? Scratches, overturned bottles, guitarists dropping their gear on your drums, or waiters who are using your drum as a doorstop, or whatever.
But there are simple ways to prevent the damage that could result in mishaps like these: HARDCASE manufactures cases in ABS material for many of musical equipments. Each case is molded in one piece, which means no joints that can crack and rivets to come loose. The same goes for the lids - they last even if you jump on them.