For a week long Disney trip, instead of checking a bag consider packing for just 3-4 days. Bring a sample size detergent and do a load of laundry at the Resort laundromat while you are there. You can get samples at Target or Walmart and it is usually $1. Much cheaper than buying it in the laundromat. You can relax at the hot tub while your clothes are washing/drying and you can save yourself $15-$20 PER BAG!! I recommend this technique on longer cruises as well!