For the last year I have been collecting free sample of laundry detergent for our next WDW trip. Last summer I took a whole box of Tide and ended up leaving half of it when we left for home. Even the smallest box took up a lot of room in my luggage. This summer I can throw 4-5 little packets in my bag and have free detergent for any laundry I need to do. I just got a free sample of Gain in the mail today, I think I now have 6-7 packets of different detergents.
Here is a link for free Downy: