I've been buying these balloons for years. They don't all work perfectly, thats to be expected. But this batch was horrible. We filled them, let them drop into a baby pool so that the kids could grab and throw them. Within 30-45 seconds, half of them had popped. 25 % more popped before my two kids could throw them. 7 and 11 years old (they aren't slow).

All the balloons leaked and we ended up with barely a quarter of them.