Is this our Sippy Cup?

How many times have you gone to a playdate and forgotten your child's sippy cup? Or even worse, had the same one as your friend's child and get them mixed up? I've tried writing on them with magic marker, putting tape on them, and all the rest. Nothing seemed to work. BumbyName Orbit Labels has taken labeling a step further with these non-adhesive, personalized labels. I think they are ingenious!