Sea to Summit Ultra-Sil Drysacks are 50% lighter than our Lightweight Drysacks. The ideal dry sack for backpackers. Product Specifications: Ultra-Sil 30D siliconised high-tenacity Cordura nylon fabric for exceptional strength Ultra-Sil fabric has a 2,000mm waterhead Non-wicking Hypalon roll-top closure with stiffener at the top for an improved seal Fully seam sealed for water resistance Translucent for easy visibility of contents Slippery finish for easy packing Round base in all sizes Use: backpackers, cycling touring, travellers.