Cold Jack Backpacks and Duffel may be lightweight but that does not make them any less durable. Cold Jack products are rugged and tough, leak-proof, and equipped with a rubber-sealed zippers. Everything we sell comes with a Limited Lifetime Warranty and feature heavy duty construction with high-frequency welding. …Waterproof Duffel Bag.…Large Opening Top.…High-Frequency Seamless Welding.…Heavy Duty Fabrication.…Super Lightweight.…Adjustable Shoulder Strap.…Comfort Handle.…Water-Tight Zippers.…Extra compartments for additional items.…Quick clean material.