Ed has been toilet trained since whatever age confirms your prejudices about good parenting. Basically, it's been a long time. But the disruption of routine can cause little campers to forget themselves and neglect the kind of etiquette that built an Empire. Or whatever it was.
Being kitesurfers/surfers and divers normally we camp near the coast, where the weather is relatively benign and there is usually access to water. However, our next camping adventure takes us inland on our way to The Other Coast, through the desert, where the nights are cold. Washing options will be limited and whatever is washed will have to be dried before bedtime.
The beauty of this instructable is two-fold, the first was making a sleeping bag insert that can be washed an dried in one day, with limited water. The second stroke of genius was buying an ancient sleeping bag for $2 that we can throw away when we reach the tropical coast (where we will simply sleep under a thin layer of mosquitos).
Step 1: Stuff You Will Need
Step 2: Sewing!
Then I got an old flannel sheet and laid it over the bag and sewed buttons on where the corresponding loops are.
Step 3: Wool Insert
You could also make another layer (as many as you like) including one of waterproof sheet material.
And that's it.