Review on Convenient Simple Modern Ascent Straw Lid Top Handle - Perfect Fit for All Ascent and Hydro Flask Standard Mouth Sizes - Reliable Leak Proof and Insulated Straw Lid in Winter White by Ray Gist

This cap has one big flaw – it's almost impossible to drink from it. They say it's airtight, and that's true, but the silicone stopper that makes the lid airtight also makes it impossible to suck out the liquid. My 3 year old couldn't and my husband and I had to vacuum hard to get the water out. After we removed the cork the water flowed freely but that means water will leak everywhere unless the bottle is held upright which defeats the purpose of this cap. That's a great idea and I wish it worked better. i will send it back