A diver who carelessly stuffs the hose (especially a long hose) under a retainer near the base of the cylinder, when clipping the cylinder to their harness is more likely to inadvertently pass the base clip and strap through a loop of the hose. If they later try to deploy the long hose, it's snagged by the base of the strap and clip, and the full length cannot be deployed until the base is unclipped. Avoid routing the hose under the retainer such that a large loop is created near the base snap. Using two retainers, or a wide retainer , and positioning the hose retainer high also keeps the second stage more tightly tucked up against the valve and very tidy.