I was looking for some time to transport my récipent a homemade soup to the office without fear that the content does not spill into my bag, and I opted for this. I am very satisfied with my purchase. The capacity of the mug is more than enough for me. It is very convenient because it passes directly in the microwave without pour the soup into another container. It also dishwasher safe. Regarding his tight, no problem, though I try to carry as straight as possible.