Made of natural thick American cowhide genuine leather. We use authentic American leather that gains character as it ages. Our Weekender Travel Duffel is made to stand up to whatever you’ll throw at it over the years. - Based on feedback we've made a few updates to this bag recently:1. The interior lining was polyester, it is now made of durable cotton cloth, that is softer to the touch. 2. Some of our customers ran into snags with the old zippers, so we've upgraded to exclusively using premium YKK zippers. 3.The stitching. We have double stitching on the handle and shoulder strap to ensure the bag last for a long time. - Heavy duty doesn’t mean heavy to carry, at only 4lbs you get a roomy (but TSA friendly) 23.2” L x 9” W x 11.8” H of storage. Note that this measurement includes the 2 side pockets. Main compartment is 19.5” L. -Antique Bronze Hardware - Our handcrafted quality hardware is riveted to thick top grain leather and finished with solid stitching. Extra rivets at stress points ensure this bag will be with you for years to come while keeping your gear safe and sound.