
There's a little black valve that should open when you open the mouth spout, but it doesn't really work so you have to fight the vacuum that's there occurs when you draw water from a straw that hurts to drink, and when you stop, air rushes through the mouthpiece into the bottle and bubbles up at the bottom of the straw. If I had known it was like this I would not have bought it. It actively fights you when you drink from it, making it difficult to drink and even deterring from using, which is particularly annoying when you're buying it to ensure you're drinking enough water a day. I ended up removing the black rubber part of the valve and now it works fine except that if I knock it over the drip slows down. Kind of a waste of money for something other than sitting at a table or in a cup holder in a car.

HomTune Unicorn Water Bottle - 23oz BPA-Free Tritan, Leak Proof, Easy to Clean with Carry Handle and Straw for School Girls
11 Review

Tomnk 9pcs Collapsible Water Bottles: Reusable Canteen Bags with Clip for Sports, Biking, Hiking & Travel - 9 Colors
12 Review

Hot drink bottle Be First 75, blue
20 Review

AeroPress Go Portable Coffee Press – Makes Delicious Coffee, Espresso, and Cold Brew in Just 1 Minute – Ideal for Travel, 1-3 Cups
15 Review

AmazonBasics Silicone Baking Mat Sheet
48 Review

4 Pack 12 Inch Stainless Steel Round Pizza Baking Pan Tray Crisper Sheet Oven Cooking Healthy For Pizzas - Deedro
47 Review

100-Pack Of Disposable 18-Inch Piping Bags For Cake, Cupcake, And Cookie Decorating - Perfect For Icing And Frosting!
41 Review

PME Scriber Needle Modelling Tool, For Cake Decorating, 5.7-Inch
38 Review