Public mailbox for packages in the UK or Ireland
Here in Spain we have a system called CityPaq, that's managed by the national post service and that allows anyone to receive a package in a public mailbox, independent of sender. They are located at central locations like train stations, shopping centers, or post offices. Contrary to mailboxes for letters, you do not get assigned a single slot. That implies it is uncomplicated and flexible for everybody to receive packages everywhere (at changing locations) in Spain.
Here you see it: 
In Germany there's a similar system:
In both countries there are equivalent private systems, where a residential building or area get a series of mailboxes for packages. But I'm interested in the system for getting a package while backpack travelling and not spending long in the same location around the British Islands. Sending to a hostel is kind of clumsy (you have to negotiate, agree and trust someone).
Is there a similar system in the UK/Ireland?
Best Answer
I've not seen a service like the one you've posted, but there's CollectPlus which I've used for shopping (generally called Click and Collect for some reason) but I've never used it for personal shipping. They have points in places like cornershops and supermarkets.
Hope that's helpful.
Pictures about "Public mailbox for packages in the UK or Ireland"
Mail Boxes Etc. UK \u0026 Ireland - Pack \u0026 Ship
More answers regarding public mailbox for packages in the UK or Ireland
Answer 2
There are various parcel pick up services in the UK, including Parcel Pickup http://www.parcelpickup.co.uk/home, UPS https://www.ups.com/gb/en/services/individual-shipper/ups-access-point-deliveries.page, and InPost https://inpost.co.uk/en/faq
Answer 3
It might be possible to use the "poste restante" service. (No, I have never tried this myself, and, according to some rumours I've heard, the service is so infrequently used these days that nobody knows how it works, including those who are supposed to provide it!)
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: vectors icon, Olga Lioncat, Mike B, Olga Lioncat