Review on Premium Leak-Proof Insulated Stainless Tumbler 🥤 - Advanced Tumblers for All-Day Drink Enjoyment by Besim Kahsar

Looks great and I love the slim design. So far it seems closed. Keeps drinks cold/hot. I wish they had more grip. They are so smooth that they can easily slip, especially when wet. But we ordered them because they are so thin and fit easily in backpacks and the side pockets of backpacks. Four stars because I ordered 3 but only one came with an extra lid with a straw. Also, all three devices arrived in broken boxes. After a few weeks of use I will update my rating. If they stay tight and don't fall apart, I'll upgrade them to 5 stars. We ordered azure, stainless steel and wood structure. Only stainless steel came with an optional straw lid. Update: They are definitely 100% airtight and keep everything cold as advertised. We've all used ours with no problems. The only problem is the straw. We had to cut off the very tip of the straw floor because it sits flat on the floor (it's rubber) and you can't suck it out if it's right up against the metal. But in any case we give 5 starts because they did.