I will go to BKK next wk for 4 days also, although your method will "waste some milk" (for showering, very creative and interestings! Let me tell my husband and let him "enjoy" milk bathing in the trip for celebrating our wedding anniversary!
I am thinking to buy the "boot storage bag" at the BKK airport after landing. But how to "double bag"?
Yes ah the Avent milk cup can only be steamed for four times as stated on the box. Hv you read it ? You should use normal milk bottles to store the milk in the fridge (not freeser) for daily use. I only use the mik bag for storage of frozen milk (which need to be stored for up to 3 months). The milk bags can store up to 9-10 oz each.