I think overall the design (with the removable inner tray) is a really good idea and I've never had any problems with it randomly opening in my bag however I've travelled with it a few times now and have run into some issues:
- like others have said it is a bit on the 'heavy' side - however it is quite sturdy and the construction of it is good quality
- the paint on the inner tray has started to chip away after only a couples uses - the bars stick to the tray and then the outer paint coating will occasionally come off when you lift up the dried bar (doesn't affect the functionality but kind of disappointing)
- every single time I've had this in my carryon airport security flags my bag for extra security screening to check out the tin
I love ethique's products but unfortunately for this one I'd suggest to look for other options. I think if it were made in a different 'lighter' material it would be 5 stars