If you need to compress down your gear into the smallest possible space while adding minimal weight, pack it into a Sea to Summit Ultra-Sil Compression Sack made from Siliconized CORDURA Brand fabric.Features Packability: In a perfect world, with perfect contents, this compresses down to 1/3rd its original volume (i.e. from 15 to 5 liters)Best Use: Internal pack organization, packing up whatever you feel like belongs in a bag that can be compressed30D Diamond Ripstop Siliconized CORDURA4 straps for even compressionExtra long straps so these sacks can really be filled to capacityBar tack reinforced stress pointsPull handle on the bottomSlippery finish for easy packing Note: seams are not tape-sealed; therefore this product is not waterproof - only water resistantWhat this bag could hold: 6 Liter: a layer, beanie, and gloves10 Liter: a puffy jacket amp; a compact sleeping bag15 Liter: all your clothes for a trip20 Liter: a tent or any Sea to Summit sleeping bag30 Liter: Sea to Summit sleeping bag and your extra layers XS / 6 Liter: Compressed Volume: 6L to 2L Dimensions: 6 x 14 in / 15 x 35 cm Gear Capacity (L): 6L Weight: 2.0 oz / 58g S / 10 Liter: Compressed Volume: 10L to 3.3L Dimensions: 7 x 16 in / 18 x 40 cm Gear Capacity (L): 10L Weight: 2.3 oz / 66gM / 14 Liter: Compressed Volume: 14L to 4.5L Dimensions: 8 x 18 in / 20 x 46 cm Gear Capacity (L): 14L Weight: 2.7 oz / 78gL / 20 Liter: Compressed Volume: 20L to 6.5L Dimensions: 9 x 20 in / 23 x 50 cm Gear Capacity (L): 20L Weight: 3.3 oz / 94gXL / 30 Liter: Compressed Volume: 30L to 10L Dimensions: 10.5 x 23 in / 27 x 58 cm Gear Capacity (L): 30L Weight: 3.8 oz / 108g