Everything!If I need to hold something, but I don't have enough hands, it goes between my breasts! I can hold any kind of cup (glass, plastic, bottle, can, etc) but not like a 2 liter or anything, haha. I can also hold in there my cell phone, note cards, writing utensils, hair brush, mousse, gel, keys, ID, money. Some of these things of course, like money and ID's and cell phones, almost anyone can hold, but some, most girls cannot. Also (of course) for the most part, wearing a shirt and/or bra makes it easier to hold things between my girls. When I was in high school, I played the piccolo my senior year for marching band and I could hold that there when I really needed to.
AND when I had baby kittens I could multi-task while holding them; I simply just placed the baby kitten between my breasts and off we went! Sure it left a scratch here and there, but nothing to worry about! :)