There are better ways to achieve this goal. Some bags already have "pad loops" attached to the outside. REI makes straps, called Slip-Not Straps, that hook into these loops and go under the pad, holding everything togethermore or less. They're $5.50 (www.rei.com). The cotton and nylon Cocoon Sleeping Pad Cover ($20) fits over a pad and creates a non-skid surface. And some pads, such as the Big Agnes Two Track ($85; www.bigagnes.com) have non-slip tops.
That takes care of the bag/pad interface. The pad/ground one is a little trickier. Most sleeping pads have a nylon bottom, and nylon-to-nylon creates a naturally slick interface. The Cocoon pad cover would help quite a bit, I would think. You also could use a different kind of ground cover, such as polyethylene sheeting bought from your local home improvement store. That will be naturally stickier than your nylon ground sheet.
If all else fails, try the 3M...
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