I am doing something similar in April. However, based on my three previous Caminos, I will plan to either mail a Caja Verde Grande or Supergrande box to Ivar, OR to my reserved lodgings at Santiago. I regard having clean clothes at Santiago as more important to having them back in Madrid. But, everyone is different.
You can find the box sizes at
www.correos.es, or rely on my research. Here are the Caja Verde box sizes (from the correos.es web site):
- Caja "mediana" 317 x 215 x 125 mm (12.4” x 8.4” x 4.9” ) [a hiking boot-sized box]
- Caja "grande" 390 x 280 x 190 mm (15” x 11” x 7.4”) [the size of a small toaster oven]
- Caja "supergrande" 590 x 390 x 390 mm (23” x 15” x 15”) [the kitchen sink" - could hold a rolling suitcase]
Just as an FYI, while at Ivar's I have seen shrink-wrapped luggage, as well as suitcases that were shipped "as is" through the correos. So, this is an option. But, I do not know their "rules" for doing this. However, and to avoid the vagaries of counter staff at the correos, I avoid the potential for drama by using the soft duffle bag approach to packing.
As mentioned, to facilitate sending tourist stuff and fresh clothes ahead from my starting point to Santiago, I use a soft, ballistic nylon, packing duffle for checked luggage instead of hard-sided luggage. The collapsed duffel bag goes into the Caja Verde box...
Also, there is a maximum size limit of 200 cm for overall dimensions. It is calculated thusly: L + W + H = 200 cm.
As regards weight, I recall there is a bracket in which up to 4 Kilos can be shipped cheaply in the "mediana" or "grande" boxes. Above that, it starts to get more expensive.
You simply buy the box at the Correos, then fill it, seal it (they self-seal), and pay for the postage. You can pack your stuff while at the correos. I do it all the time, dumping my rucksack on a table, or the floor, and sorting stuff back into the rucksack or into the shipping box. The staff see pilgrims do this every day, so they usually do not say anything. Just be neat and quick about it and do not disturb the other customers.
The Spanish Correos is very inexpensive and offers excellent value for service. Mailing things within Spain is MUCH less expensive than domestic USA shipping. To send maybe 4 kilos from Madrid to Santiago should cost about 10 - 12 Euros if I recall correctly.
I KNOW Ivar will be glad to accept and hold my tourist clothing and stuff I picked up in Madrid before starting out on the Camino de Madrid. However, I must check with the Santiago hotel before I leave the States to find out which place I will mail my stuff to.
My approach to sending clothing ahead to Santiago allows me to have a complete change of clean clothing, including footwear, to change into as soon as I arrive and bathe. I can then find a local "lavanderia" (laundry) to get all my Camino clothes washed in one go. That enables me to head out and ramble...
I hope this helps.