SIPLINE 10 OZ Stainless Steel Vacuum Insulated Lowball Tumbler Rambler Flash Traveler Mug Thermos Cup Perfect for Tea | Coffee | Water | Indoor & Outdoor

Price was the main reason I purchased this over other tumblers of the same style.Lid fits tightly whether hot or cold liquids are being used. Average sized drain/sipping and vent hole compared to Yeti and others.I tested it with some hot water and it held temperature fairly well. Initial temp of water was 188 deg. After 1 hour temp had dropped to 155. The outside of the mug was barely warmer than room temp. I could tell there wasn't a lot of heat being lost through sides. I have another 10 oz tumbler (with no lid) that lost 40 deg in 10 min. So heat conservation is fairly good.I filled it with ice cubes and water, 2 hours later I can see the ice cubes have melted a little, but not like they would in a regular glass. Again, the outside of the cup was at room temperature, not chilled from the ice water.I can recommend this tumbler and would buy again.

Super high quality tumbler. The lid is extra tight and the vacuum seal works wonderfully. 5/5 - would buy again.