A length of elastic cord with a hook at each end. Useful for fastening things to trees.
These items grow in woodland on exercise areas (well, I haven't had to buy any for years). They are lovingly harvested by careful storesmen, so that they can be put in big sealed plastic bags and put on a shelf in the QM's store with the Straps, utility. Of course, the ones in the stores are green with black hooks for camouflage purposes. And a bright yellow marker tape that gives you the NATO Stock Number. Yet another masterpiece from MoD(PE).