Sending
Book a door,
drop it in.
Choose the locker, choose the size of door, pay with M-Pesa. You get a code that opens it, and so does whoever is collecting. Nobody has to be there at the same time and nobody has to meet a stranger.
Prices depend on the size of the door and nothing else. A small door takes documents, a phone or a pair of shoes; a large one takes a gym bag. What you pay covers the first day it sits there.