Summit ストローフタ付きウォーターボトル

My daughter’s been using this at school for a month and the vacuum insulation really does keep her water ice-cold all afternoon. The lid is easy for her to flip open with one hand and hasn’t leaked once in her backpack.

The straw lid is genuinely leak-proof even when tossed sideways in my kid's backpack, which is a lifesaver. I also love that the double-walled insulation actually keeps their water ice-cold through a whole school day. This thing is built tough too, it's survived a few drops already without a scratch

The vacuum insulation actually works—ice was still floating after lunch recess. The straw lid seals tight enough that I trust it in a backpack. Only wish the strap were a bit longer for carrying.