Glenn F.wrote a review of Hydro Flask 18oz Food Flask on May 25, 2017
Familiarity: I've used it several times
Same review as the 12 oz I left. bought an 18 oz with the same problem. Can't get the lid off if you put hot food in. Soft gasket and the lid thread design will not get the lid off. There is a suction that develops and the lid just keeps spinning. You need to pry extremely hard to get the lid off with little to grab onto. If you do get the lid off, the gasket gets sucked into the food. Good for cold food, terrible for hot food. Problem every time with hot soup. No soup for you.
Tried flipping the gasket, tight, loose, same result. Food is hot and cold though. Hydro Flask Customer service is non responsive. they have successful, proven hard gaskets, yet they go with this useless soft gasket design.