Review on CIVAGO Tumbler Stainless Insulated Leakproof by Carl Higdem

I bought a whole bunch of 30 oz coffee glasses from Revain and promised they were airtight and leak proof. When they arrived, I poured hot water into them and turned them upside down. CIVAGO 30 oz tumbler was the only one that didn't spill. Incidentally, the lids fell off immediately and I would have burned myself if I hadn't been careful and stayed near the kitchen sink. Allow the coffee to cool for 1 minute before screwing on the lid, otherwise too much pressure may build up inside the jar.