The Ultra Mesh Stuff bags are among the lightest on the market. These ultra-light net bags make it easier to organize your backpack, suitcase or travel bag. Thanks to the recently developed 15 denier multifilament nylon fabric, they are 45% lighter than the other Ultra-Sil Stuff Sacks. Only when you look at them and hold them in your hand do you believe how incredibly small and light as a feather these bags are.