I thought a picture would explain the whole parcel-forwarding idea faster than any long write-up, so I'm sharing this illustration I keep running into — a Polish address that receives your shopping, consolidates it, and ships it worldwide.
The flow in three short steps:
1. You sign up and get a Polish delivery address.
2. You shop in Polish stores and have everything delivered to that address.
3. The forwarder consolidates your items into one box and ships it wherever you are.
Simple concept, big savings when you compare it to ordering the same products abroad (when it's even possible). Happy to answer any questions from newcomers.