Got one of these on whim and I am very impressed. It is quite large though, so in my opinion its not really inconspicuous and I personally would not recommend having this on your key ring....but nevertheless it is great if you want to have a hardy and smell-proof way to carry your roll up. You could take this with you to work i.e. placed discreetly in your bag and not have to worry about smells escaping.....the screw cap is sturdy, and even a very large or fat roll up can easily be stored, so it would be good even if you plan to share your roll up. 10 out of 10.