Being made from a mesh fabric the Savotta Rolltop Stuffsack - Mesh 10L 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, 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.