Laundry sheets - anyone use them?

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We received a Magellen's travel catalog and they had a lot of non liquid sheet items that you could carry on the plane like shampoo and conditioner sheets and laundry sheets. The description is 50 loads of laundry and they weigh one ounce, anyone ever used these? They sound interesting. We are taking our first trip with our daughter in December and she will be 11 months old so we probably will have to do laundry!