The Ultra-Sil® Duffle Bag is the ultimate in lightweight bags. With an incredible capacity of 10.5 gallons / 2420 cu. ins / 40 Liters and strong enough for a heavy load, it is the perfect bag as an airline carry-on, for impromptu excursions, or just going to the gym. Super compact and super light, it is an obvious choice as a spare bag on any trip.