I think he is referring to the "snake" hose. When you add pressure it swells and straightens and when you turn off the water it shrinks back up.
I almost bought it until I did some research and found out:
1) No way to coil the hose with pressure in it. It is all over the campsite when pressurized.
2) Can not keep the hose pressurized for long periods of time without ruining the self collapsing feature.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW