Amy, we went to a wedding in Philly last year, and all of the grooms family and friends were travelling to the wedding because we live on the east coast, so there was a lot of us at the hotel. For OOTs they just did a box, and inside was the weekend itinerary, a bottle of water, a soda, and a couple of snacks, nothing major, but it was great to get when you weren't expecting anything. Especially when we woke up hungover in the morning.
So, I guess what I'm saying, is even if you just did paper gift bags & just went to costco when you got there and bought some cases of water & soda and some snacks, I think your guests would still really appreciate it, even if you don't get all the other stuff to go in it.