The lockers in Poland can be used for both receiving and sending items. It's a massive QoL improvement in many ways over old school:

- you can receive things while you're not at home, don't have to carefully plan to be there for the courier (who then misses initial date and you need to do it again next day). It works 24/7 so you can pick up your stuff in the middle of the night if it's more convenient. You have 48hrs to pick up.

- you can send things, also 24/7, so no need to go to a blessed place between 9am and 5pm during week and queue. You can send your item Sunday evening, no problem

- the costs are also very reasonable. I sent a parcel from Poland to France for 7€ this month.

- you don't actually need to print anything nor even write the address. The courier opens the box, and they print a sticker with destination address.

- I believe it increases throughput because the courier doesn't have to stop at 100 places per day, they stop at lockers and unload N packages at once in every locker. Higher throughput -> shorter delivery times and lower costs