SWMBO, has said they are no good as they are not food grade, a hose is a hose dear, it is a hollow length of tubing that delivers water to where you need it, taps foot,
The guy in the caravan shop will say they are no good, when he has metres of the blue plastic stuff he wants to sell at inflated prices
On a serious note how many of you have tried to put away your water hook up hose some of them can be several metres long, one of these expendables could be the answer, got mine off ebay the up to 75 foot for £20, it will also be good for giveing the van a wash down as all atatchments fit