I have about 100 guests also. We are doing welcome bags too - one per family also. This amounts to about 50 bags.
I'm also not doing them for the guests who are only coming to the wedding (we are having a welcome party the night before) - but we've had great response to the welcome party idea, so this is only about 3 people that are only going to the wedding day stuff, lol.
For disney resort guests I'm going to deliver them to the resorts. For off site guests I'm going to bring the bags to the welcome party. I think its a nice touch, and its been fun designing them and finding stuff to put in them.
What's in mine (or will be when the bags get here, lol):
1. Tote bag with logo, our names and date, in wedding colors (pink and green)
2. Maps of each park
2. buttons - first time and "we're celebrating"
3. Mickey stickers (the free kind)
4. hot sauce with custom label (I love hot sauce, so a lot of people will get the joke - hopefully)
5. Bottled water
6. Snacks - TBD
7. Stuff for kids if any (there are only 8 kids coming, so I just hit the target dollar section)
8. Updated newsletter and schedule of events