Ultra-Mesh stuff sacks are some of the lightest stuff sacks available to organize gear in your pack, suitcase, or bag. We use an advanced 15D multi-filament nylon mesh only recently developed. These stuff sacks are 45% lighter than our Ultra-Sil stuff sacks and have to be seen to appreciate how small and light they really are! Product Specifications: 15D multi-filament nylon mesh for strength Ultra-Sil Nano drawcord throat in assorted colours for smooth operation Sea to Summit logo label and size label used to pull stuff sack open Double stitched and reinforced seams for greater durability Black mesh for better visibility Round base design.