Hello. Boys: (I'm no sure what they're called, but they are those things that you throw on the ground and make a popping-cracking sound), ball, stamp and candy, small bag of cookies/chips. For the candy, I would recommend chocolates that are wrapped with sport ball designs, Maybe since it is close to the fourth of July, you can dip licorice dipped in blue and white chocolate (melted candy melts), tech decks, key chains of whatever kind of object or theme/hobbies/interest they like. For girls, you can get them a mini perfume, a stamp, candy, a key chain of any hobby,interest,or theme they like, a bag of chips or a bag of cookies, I think baking small cookies would be good or cake pops as well (that are fourth of July themed) nail polish, bracelets, maybe some stuff they need like face cleansing wipes, a mirror, or magnets/chalk boards, picture frames, phone cases. Hope I helped and good luck with your party bags. :) BTW: Shown below is a bag of sport chocolate for boy treats.