Might take a bit to answer if I have to hit the ground running.
Is it for cleaning shoes or preventing the floor getting dirty?
First one! Cleaning shoes. You appear to be the first person to guess without cheating!
I’m guessing it’s for cleaning a collection of something small. You throw them in, zip it, and put the thing into your washing machine. Not sure what for, though - Could be pebbles, dices, loose teeth, etc. Keycaps, maybe?
Corn in the cob.
It looks like a car washing sponge. It could be make reversible to it doesn’t pick up abrasive particles when it is unused and left out to dry
Idk but I’d definitely polish my bong in it.