Given a travel related situation, and given a specific question about the situation, summarize the question into a title
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Question: Is it possible to buy (western quality) disposable nappies (diapers) in Costa Rica and/or Panama?

In Costa Rica we are planning to be in: La Fortuna, Monteverde, Montezuma, Manuel Antonio
In Panama: Boquete, Bocas del Torro, Panama City

Answer: Nappies (diapers) and baby wipes in Panama and Costa Rica

Question: When travelling between France and the UK via the Eurostar train, I have never actually been stopped by customs on either direction. I've seen some people being stopped, but it seems that it's on a somewhat random basis.

I'm considering traveling by coach this time, but I wonder if the customs are more strict, e.g. should I make sure to have receipts for all my electronic equipments (laptop, camera, etc.) and fresh fruit (to prove they were bought within the EU)?

Also, for coaches travelling during the night, is the procedure lenghty? The coach website displays the total travel duration, but not the amount of time one should be "awake" (e.g. waiting for customs or something else), so I wonder if I would be able to sleep during most of the time or if I'll spend, say, one hour waiting for customs clearance, or something like that.

Note: my question is more about the practical situation of a coach-based customs (which I have never actually been through) than the theoretical fact that one should always bring receipts for each valuable item in their luggage.

Answer: Customs in coach travel between France and UK

Question: In Germany there is a brilliant service called packstation. I envy my German friends for this service where packages can be delivered which you can then collect at any time. Typically they are located at very public places (typically gas stations). In Germany you don't longer need to stay home to receive a package.

I will be traveling through Germany soon, where it would help if I could use this service as well. Unfortunately the registration website requires recidency in Germany.

Is there really no way non-residents could use this service?

Answer:
Can you register for a "packstation" in Germany if you are traveling through Germany?