Cool... I was thinking along the same lines (although going with just a blanket).
I'm building a lv 15 Magus (Eldritch Archer) for an arena-esque charity game, where watchers [just found out it will be live-streamed on youtube XD] can donate money in which something 'triggers' for the players. (i.e 'random' enlarge person here, Mad monkeys there, or summon a ahem... *pulls out the list and puts on reading glasses* oh right... a Kraken for $10.00)
Long story short, I didn't want the off chance that something happened within said bag. Thanks.