I just noticed that they weren't fitting well and that we were having several leaks. I can't remember the age, sorry! Have some of the next size on hand jic it happens. Also if you haven't opened the other ones, the stores will take them back and sell you the next size probably not the same cheaper price though!

Depends on the brand I think Shannon? We use Dymples and they are 5kg-11kg and they come in boxes of 96.