We have had them for a week now and my daughter is very happy with them as they slide out and never stay put. I filled it with water but read other reviews and agreed that sand might be a good option. I'm not sure if we only have a good one, but without holes - everything is fine. It's a really good size (for a little 7 year old) and if the kids can keep it from bursting we can use it for a long time.
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