copygirl
Backpacks can be placed, but not reequipped in adventure mode
There's another similar problem with backpacks. Actually, it's exactly the same problem.
Whenever placed, backpacks bypass any permissions set on server but they can't bypass permission on equip so WorldGuard-protected area is a magnet for backpacks infinitely allowing them to be placed but not picked up. This is very annoying. If it's impossible or hard to make them bypass permissions on pick up, doing something about denying placing them in protected areas (emulate player right click?) would still be better than now.
Actually, backpacks do check if the player has permission, but the Vanilla Minecraft way to do so seems to be completely overlooked by WorldGuard..?
Hmm, yeah, that's weird. Dunno what causes the problem then, but it's definitely there nonetheless.