Sharpie on a bento box?

[astrangeone]

I got a cheap box from a local supplier, but the problem is that it's too plain.  It looks like it's just made from regular old plastic.  I'm worried that the Sharpie would rub off on my bag - my bento travels in the bottom of my knapsack.  (And the fact that I hand wash everything in my bento box.)

(The sharpie drawings will be on top, just the lid.)

[Listessa]

From what I have experienced, Sharpie does tend to wear off when applied to smooth plastic surfaces.  I can make a mess of other more porous objects too.         

Maybe you could try putting some sort of clear coat protector over it after drawing?