They should be okay just don't over fill them. That's a lot of water balloons!!!
Have fun :D
that will be great! Good idea to prepare!
tomorrow i am having a sweet 16 starting at 3pm. right now it is 5pm the day before my party. im going to do 500 water balloons and keep it in a kiddy pool in my garage until tomorrow. would they all be popped in the morning, or will this not work?? the more info the better. thanks(: