This idea starded off as a no sew project, but I had trouble before with the gliders squeezing their way out the tied sides of a no sew bag, so I gave it a liner instead, and added grommets/eyelets and a pull string with stop/toggle.

Edit: The tool I used for the putting in the grommets was a cheap two piece setter and a hammer. You place the two eyelet pieces between the metal setter thing and hit with a hammer a couple of times.