The 1 Point Tactical Bungee Sling is being offered for an excellent price on Amazon... $5.65 with free Super Saver or Prime shipping. The sling comes in a plastic zip lock bag wrapped in a rubber band. The sling is black, although the photo below shows it slightly lighter due to over-exposure (to show texture).
The sling is adjustable for various body size. The adjustable components are all made out of hard ABS plastic.
It comes with a quick attach/detach hook (see photo below), which made it extremely easy to attach and detach from the rifle. It is the only component on this sling that is made out of metal.
Actual experience at an indoor airsoft field showed that the sling is just big enough for a small to medium size person. It is probably too small on a large person. I consider myself fairly small to average and I have used it at full length. The upper part of the sling is not padded, so it is not comfortable rubbing your neck. You'll probably want to get some padding for it (extra expense) or wear clothes with collar.