The Sea to Summit Ultra-Sil Day Pack is an indispensable and versatile minimalist bag with a 20-liter capacity that weighs less than 3oz. Ultra-portable, it packs down to the size of a tennis ball and includes an attached stuff sack with handy carabiner. Features two-way zipper closure, ergonomic shoulder straps and webbing loops for attaching a bike light or keeping items handy. Durable and water-resistant 30D siliconized Cordura Nylon and reinforced bar-tacks mean the pack punches above its weight with incredible strength-to-weight ratio. Toss it in your luggage for travel adventures, in your purse for impromptu shopping trips or fill it with snacks and a warm layer for day tripping in the mountains. Weight 2.5-ounces.