I do not recommend the X-Hose or any of the so-called "pocket" hoses for fresh water supply line. Here is why.
IN 3 of the campgrounds I frequent it is not uncommon to loose water line pressure, when this happens the hose attempts to "Retract" and when that happens it pulls on the fresh water inlet.. now in my RV due to the way things are that's not going to be an issue (it will be pulling on a solid brass fitting not the RV's inlet) but in most it can pull hard enough to pull the fitting apart.
Now. An option: There is something called a "Flat Hose" this comes on a reel, 25 or 50 foot or 100 foot long in most cases.. Most all the advantages of the X-Hose but unlike the X-hose it does NOT put itslef away.. i have one that's aroudn 20 years old I use on rare occasions for tank fill (not fresh water hookup)_ When When stored (Coiled on the reel) if you took the top off one of those 5 Gallon pails you get at Lowes or Home depot.. it would fit INSIDE the lid Makes it easy to Store
The proble with thes howerver (also applies to X-Hose) is this
They are a fabric jacket over a THIN plastic liner. The liner is short lived.. My Flat hose has several leaks, which is why it is only used for flowing water.