The Ultra-Sil Pack Liner by Sea to Summit is the ultimate go-to for your next backpacking or hiking adventure! An ultra-light, compact and waterproof pack liner to keep all your gear dry when the grey clouds roll over. The design features waterproof, double stitched and tape sealed seams for superior protection. The hypalon roll top closure is both watertight and easy to use, whilst the Ultra-Sil fabric increases overall durability. The Ultra-Sil Pack Liners are available in 50, 70 and 90 litre variants, and when they weigh less than 100g for a 70L size, the Ultra-Sil Pack Liners are a no brainer!