You are off on a vacation and want to take a portable pottywith you. If your family are unkeen to squat at the rear a tree, a portable toilet is a must have thing. Heading behind a tree is not always practical anyhow even if you have little objections to the idea.
The porta potty is a great alternative, and there are an array of styles to choose from, appropriate for campers, caravans, etc. The porta potty is small and easily put out of sight. Get the correct one and it will last for years.
There are a range of producers in the market, and portable toilets are sold in many shops. All the good brands like Thetford, Coleman, and the Nature Loo porta potti can be found on line.