Niviuk introduced this NKara concertina bag in February 2011. It has a medium to heavy duty zipper, medium weight material to protect against the elements, and zips up from the trailing edge to the leading edge. So, you wont be pushing air out of your trailing edge anymore. There are also 3 internal straps to cinch the glider down before zipping it up. there is also a riser bag installed on the inside to store your risers. If you keep your risers attached to your glider when folding your glider, you can easily remove the stitching from this riser bag and convert it to a bag for accessories to your flight kit.