Do you mean the cooler type things Lenny? I use stainless steel drink bottles for the kids - I did start with H2Onya's but their bottom is separate to the sides so they would crack along the seal if they were dropped. So I went to Eco Tanka's and Kleen Kanteens and they are dinged up and still going strong. The plastic ones to tend to wear out a lot quicker and they smell after a while too which I why I went to the stainless steel. You can get the different tops for them too - I like the screw lids that you take off, but the kids have the sports lids with the pull top. Never had a problem with them leaking unless the kids didn't push the top down properly. My kids have 1lt ones and most of the time they are fine, but they have started packing a second, smaller drink bottle as well for the really hot days.