Being made from a mesh fabric the Savotta Rolltop Stuffsack - Mesh 5L functions very differently than most packing sacks, and offers very different functions. There is stuff in this world which you don't want to pack, transport or store water- or air- tightly, and mesh does just that. As a bonus mesh allows you to see through it, helping with identifying the contents of each sack if you have a ton of these packed with various gear.