Stems, a bowl to hold the grapes, somewhat sticky fingers, seeds (unless you get the engineered no-seeds variety). Yeah, can't vouch for the logistics of grapes.
Have you eaten grapes? They don’t make your fingers sticky, they have a decidedly non-sticky skin. Most of the varieties I see at the supermarket are seedless.
Picking them off the stem you might occasionally get some juice on the fingers. Not a big deal but more than you'd get from a Quest bar or something. Seedless is a lot more common in the US than EU, I think.