Its a small backpack but my kids are 1 and 3 so its the perfect size for them. I can fit their Funtainer drink and a few snacks, a toy or two, and a pair of sunglasses in it no problem.  We get compliments on them everywhere.

I haven't tried to wash them yet but they look durable  and Im sure they could survive a machine wash and dry.

Tried the leash option at the airport but my kids mostly freaked out that they were on a leash and I nearly strangled the one year-old because it almost got wrapped around his neck, so Ive put the leashes away and its just not a feature that well use again.