I gave 4/5 stars, mostly because the sweater portion is a royal pain in the arse to get on and off of the product. The product does work as advertised and holds a good bit of water inside. I have not used boiling water, only hot water from my sink and it worked well. You could use these bottles for a number of different things, so I highly recommend having one on hand. You never know when you'll need it most. It does not leak, and the plug is simple to unscrew and screw back in.
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