It is a good idea but unfortunately doesn't have a leak proof lid. Food inside can also tend to get squashed as the rubber is very flexable. I like the way it collapses for storage though. The fork holder is difficult to unclip, however, I just turn the holder upside down and store the fork on top so you don't have to unclip the fork cover each time.
Thanks for your feedback Cassia, we really appreciate it as we can keep it in mind for the future. This collapsible lunchbox is great for saving space when not in use but it isn't the best for storing liquids. Hopefully, you manage to get some use out of it never-the-less.