Zpacks Tall Dry Bag

The Zpacks Tall Dry Bag is a long, narrow waterproof liner built for external carry rather than sitting inside the main compartment. Its slim shape lashes to a pack's base straps or slots vertically into a side pocket, keeping the load close to the frame instead of bulging out. Because it rides outside the pack, it's best suited to items that can handle a knock or two on the trail - a tent, cook kit or spare layer - rather than anything fragile. No weight or exact volume is listed, so match it against your pack's strap spacing and side-pocket depth before buying rather than assuming a universal fit.