Rubber Sleeves To Make Sling Pockets. This isn't a tutorial, or a step by step method. Just a way we used to secure a spare knife, (or anything else flat) between our sling straps. The pics here are of an 1 1/4 wide by 53" long, M14 - M16 two point sling. The sleeves are just bicycle tubes, appx 1 1/2 on the small measure. Whatever size strapping your making sleeves for dictates the tube size. Some experimentation is usually required. If the tubing slips over a single strap, and 5" piece of tube slides a bit hard, that usually works pretty good. Tightening is achieved by leaving enough extra tube & backrolling it into a garter. We used adhesive tape too, & blacked it out with face camo, mostly to silence the buckles & hardware, which make an awful racket when your trying to be quiet. The rubber tube sleeves, or boots work well, and look a bit more "Tacticool", they can also be slipped up & down pretty easy with some practice. So, even if you do a "Butch & Sundance" into the river, and lose all your gear, you'll still have an extra knife stashed. As long as you can hold onto your weapon that is. It works best if you set your sling adjustment for carry up first, with the adjustment buckle at the shoulder, then make the carry pocket at the stock end of the sling. Very old school stuff.