We went 4 weeks ago
Without naming our agency (odd new rules on the board), there is the infamous "blue bag" they give you. Sound familiar at all?
Since you are going alone, pack very light. I didn't travel alone, but did manage to put all my stuff plus cameras and paperwork into a carry-on bag. ( wore things 2x and did some laundry there in sink. Brought about 3 days of clothes to last 7 days)
What our agency provided (check with your agency to see what they give you):
- carrier (not great, but if child is small, will do). Or bring your own.
- 2 bottles
- about 6 diapers and small packet of wipes
- 3 bibs
- 2 outfits
- pacifier
- canister of powder formula
- blue bag to hold it all
What we brought (other than our stuff) was: gifts for foster family/social worker/doctor, about 6 diapers (we got our child the day we left and was only about 10-11 hrs to get home), extra wipes and baggies to store dirty diapers, picked up a large bottle of water in seoul before we left (to make bottles), a couple of small toys, burp cloth, outfit, and our own carrier.
They'll prob. make you check the stroller, so a carrier you can wear may help (and the child may like it better, since they are use to being carried all the time). We have an Ergo carrier.
Also, since going alone, bring something to organize all your paperwork - maybe small expandable folder. Will really help to be organized on the way back with all the paperwork you'll need to dig out repeatedly.
Other things: money (don't bother with travelers checks - hardly anyone takes them over there), camera, power converter if needed (note that the outlets are recessed about 1/2"), a list of questions to ask the foster family, guidebook and/or list of sights to see.
When you get there, buy a subway pass. We got one for 10000 won (about $10) and it more than lasted us the week - had 4000 won left on it. Subway is very easy to use, clean, timely.