Thanks!

And, yes, we're going to Pompeii too.

My biggest concern is with bringing this backpack (camera case in bottom - zips and snaps shut, backpack on top). I wouldn't put anything of value on top, but would have a camera lens in the case (camera would be around my neck).

Do you think backpacks like this are a bad idea? It's hard to open the bottom of this pack while it's on and you feel pressure from what's in the backpack on the bottom and on your back if you're trying to open the bottom compartment.