I am super happy with my flip and go stainless steel mug. It is so perfect for commuting with its handle and lock. I cant say how many times my drink poured out into my bag. But it has not happened once and I attribute that to the locking system. This mug also has a handle I can use to either carry or attach to my bag. It's super lightweight. The rest of my mugs and cups that are steel are rather heavy and this one is very light. And everything comes apart so you can clean all the crevices. And most importantly it keeps my drink cold. I am constantly thirsty and began carrying a mug wherever I go and have had quiet a few of them. For being so lightweight it really keeps my drink nice and cold and my ice does not even melt.