Ideal for travel when rain storms threaten, the Sea To Summit Ultra-Sil Dry Daypack 22L is a waterproof packable pack, made from siliconized CORDURA® fabric. With seams that are double stitched and sealed with high-density PU seam tape and by having a double hypalon roll-top, you can spend time enjoying the outdoors, knowing your belongings are protected from the elements.