This was an interesting iteration of fellow carter cap for their thermos, my wife wanted something that she can use while driving so we wanted to give this one a try. Since she drink mostly milk drinks so cleaning it become an outmost priority, if not then there will be lingering flavor from previous drink. First one need to be aware that you need to take this apart in order to clean it properly, the spring and every single part of it. However, soon we discovered that it's not really possible to remove all the lingering smell/taste due to it's construction.

Second, this is somewhat water tight, as in if you accidentally tilt it, it won't spill. It's not so water tight that you can put in your bag/handbag and forget bout it, since it will spill out and make a mess for sure!

Third, it's not something you can easily open when one hand. You certainly can, but it takes some effort and attention, so something harder to do while driving

I finally decided to pick this up and I’m glad I did. Having to twist off the original lid on my Fellow Carter Move wasn’t convenient when you are on the go. This made it easier to use for sure!!

This is a great accessory to the thermos for car rides - especially for the driver, allowing for fuss-free sipping. Like all fellow products the design is functional and beautiful.

Looks fantastic, a pleasure to use and does the job!

Excellent lid. Fits by 8 oz Carter move mug really well. Looks great and easy to use. Strongly recommended!