You CAN mail slow boat from Italy. It requires 5 kilo minimum (in Italy) and to Thailand took about 6 weeks.
We've often sent a parcel to ourselves in the post, generally waiting until the last 2-3 days of the holiday, as even on the slowest rate, it can be quite quick to arrive in the UK. Italy's postal service has a bad reputation in England, but I think that is all down to postcards, which I recall reading are treated as 'clearly not urgent' even though the postage is the same as a letter.
I must admit it's not just about fitting into a tight luggage allowance, but also a lovely treat to receive a parcel from Italy to reignite memories of the trip. I think 12KG is the most we've sent back before. Cost varies by weight & destination, but for us is typically 40Eur (up to 10kg)
PACCO ORDINARIO INTERNAZIONALE
Zona 1 kg 3 kg 5 kg 10 kg 15 kg 20 kg (up to this weight)
1 22,00 25,00 30,00 40,00 45,00 55,00 (Europe/EU/UK)
2 24,00 30,00 35,00 50,00 60,00 75,00
3 26,00 32,00 40,00 52,00 65,00 80,00
4 28,00 34,00 42,00 55,00 70,00 87,00 (USA/CAN)
5 32,00 40,00 50,00 70,00 100,00 120,00
6 38,00 45,00 55,00 90,00 125,00 170,00
A quick how to do it:
- Getting the box and packing materials. Whilst you can use your own box, for ease we always use the Poste Italiane boxes which from memory are around 4-8 Euro and come in about 7-8 different sizes. Ask for 'una scatola' (if this doesn't register, add 'per spedizione'. Currently yellow in colour and always a little flimsy so best to use packing tape rather than sellotape (generically referred to as 'scotch' in Italian). Make sure you know where the stickers & address details go, so you don't tape over these. By buying it from the post office, they'll give you the declaration of address / contents etc. form, plus the stickers to make a tamper proof seal. If the post office don't have bubble-wrap (plurobol seems to be the most widely used name for it in Italy), then find a backstreet homeware shop who usually sell it by the 5m for not much money. As it's wide, 5m is always more than enough.
- Filling out the form. Most is in Italian from recollection, but armed with a small dictionary or the internet, it's easy to work out. This isn't too easy to read, but the 1st section 'Da' is from details (I usually use the address of where we are staying in Italy), the 2nd section 'A' is where it's going e.g. your home address. The next box down is a declaration of what's in there and approximate weight. We always find this a compromise, as we might have a dozen different items in a single parcel and there are only 4 rows, so try to summarise as best as possible and I often leave the last one without a weight, so that it can be entered to make up the difference to the total. Price is something you'll know pretty accurately, and a degree of insurance is included in the cost. I can't read / remember the other boxes, but a number are to be entered by the clerk. Getting most filled was always tolerated, as they'd ask the rest. There are is also an address box on the parcel to fill out and the stickers need to be put in place to finish (i.e. once you've packed the parcel & sealed it)
3. Back in the post office. As with buying the box, you'll need to take a queuing ticket for the relevant service in all but the smallest post offices. This can be confusing, but we never guessed wrong when we started, so I think it's easy to work out. I suspect they wouldn't care if a foreigner picked up the wrong ticket. When your number comes up, go to the appropriate desk number (you'll be able to guess the 2-4 likely desks if you watch the monitors).
4. When at the desk. I usually say something like 'Vorrei mandare questa scatola all'Inghilterra' but frankly you have a full yellow box and a mostly completed form. It's pretty obvious what you want to do! They'll check the form & ask you to pass the box over the desk or into a weighing cubicle. They'll also want to know which service you want. These options are online in Italian here
https://www.poste.it/bisogni/spedire-e-ricevere.html but I'll typically ask for 'Da più lentamente' : the slowest (currently 'pacco ordinario estero' : basic parcel overseas). On one occasion only, the clerk asked for an IVA (tax code), and wouldn't allow us to send the parcel without it. They were wrong, but we simply went back the following day, was served by someone else and didn't need it. If this worries you, then someone has posted on the forum the way IVAs are generated, so you can have your own anyway!
and that's it, just journey home and await your local postman delivering the parcel. It sounds complicated, and it is quite daunting walking into a bustling post office and not knowing how it all works. Hopefully this helps demystify it, and like me you'll end up quite looking forward to this, as further embedding of the culture & way of life in Italy. It's also good for those that enjoy people watching.