I got this to facilitate cold soaking my lunches while hiking, and boy did it ever deliver. This piece of gear has helped me shed weight and become much more efficient on the trail. When solo hiking the last thing you want to do is a bunch of chores and clean up, and wiping this out on the trail rather than having a bunch of dirty freezer bags to cart around has been my go-to option.
When I stop at a water source in the morning I start cold soaking and by lunch (usually bean salad of some kind, or a meal replacement smoothie) is ready to eat. It's like my food cooked itself! Same routine in the afternoon, and then I'll heat up dinner and be done eating before I arrive at camp, so no food smells near my camp to attract animals. It's easy to clean, and just truly a multi-purpose gear item that has been more than worth the investment.
I have had minor difficulties with the threads of the lid/jar getting crossed, and the lid gets stuck. It is also somewhat tricky to get water out of the inside of the lid after washing, but strongly shaking it seems to help somewhat. Overall the design is great, and I haven't had any problems with the silicone ring either. It stays on well.
Thanks to Vargo for this excellent piece of gear!