We have 70 people as well and we are doing bags (even though I originally said we weren't!) but nothing that is difficult to pack! We're just putting everything in a regular gift bag with a tag and then we have custom collapsible koozies like @IzzyDeee has above, a hangover kit in a muslin bag stamped "In Sickness & in Health", welcome note/itinerary, and some local food items. We'll go buy snacks and Red Stripes (to put in the koozies) when we arrive.
My fiance may get mugs for his would-be groomsmen (we don't have a bridal party) but that was just not feasible for a group this size! Hopefully people use the koozies.
We have like 70 people coming and I want to do OOT bags but FI thinks it'll be a waste of money. I like the Bubba idea and maraca but there's no way I can lug 70 mugs down there!