We tried the Purex combo detergent/dryer sheets on our April trip. It worked just fine. You could pack them in your suitcase easily.
If you don't get it, just call and ask for it. We also use the 3 in 1 sheets when air travel is involved but have a stock of the single use boxes from when we've carried our on to places.With Trash & Towel service, Housekeeping will:
Empty trash and replace liners in trash bins.
Provide fresh bathroom linens.
Replace shampoo, facial soap and bath soap.
Replenish facial tissues, paper towels and toilet paper.
Replenish coffee, sugar, cream and sweeteners.
Replenish dishwashing liquid, dishwashing detergent, sponges and laundry detergent as needed in one-, two- and three-bedroom Vacation Homes.
I've tried the Purex sheets as well, and they are definitely the cheapest and easiest way to go when you are traveling. I have pre-measured powder detergent in the past, and won't go back to that now that I have used the Purex.