Bests & Worsts Reviews from Amazon

Fits right onto my 40oz Thermoflask! This straw from SIM is better than the one that comes with the Thermoflask I purchased here on Amazon. The flow is outstanding, can really rehydrate you quickly, and most wonderful of all......the top is really leakproof. The straaw tip is hard to prevent little onesbfrom wanting to bite it. But beware.....since the top will keep your bottle airtight, pressure CAN build up in there, so if you've got something carbonated or you haven't touched it in more than 4 hours, you'll want to unscrew the top a bit to prevent backflow explosion!! Just tighten it back up after you released some of that vaccuum sealed power. Lol.