The Ultra-Sil Dry Day Backpack from Sea To Summit is light in weight at only 110 grams. It can be packed to fit in most pockets and has a surprising versatility for its size. The incredible strength-to-weight performance makes the backpack a great piece of equipment, should there be sudden changes in your plans where you need more capacity here and now. The siliconised nylon fabric is water resistant with reinforced stitching at key stress points for increased durability. The bag has a practical compression net on the front, so you can ensure that all the contents don't move around.