The Face Face Mask
I'm so sick of seeing people in the Underground wearing mask wrongly. There must be someone in their life that disapproves them wearing a mask like that. So, get those mask that has faces printed on them, so they have to wear it properly, or else they're going to look stupid.
People don't know where to put their masks after taking them off. The masks then are very likely to end up on the street. This increases the chance of the masks damaging the ocean/environment.