This travel duffel complies with airline carry-on standards and can be taken on the plane and placed under the seat. It's a very functional and versatile gym bag, lightweight but well-made. Durable and sturdy, it won't tear easily when full. The sport duffel bag has a detachable shoulder strap that can be adjusted freely for one-shoulder or crossbody carrying. Two hand straps on the top make it easy to carry. This overnight bag is well-constructed and sturdy, maintaining its shape even when empty. The weekend bag features a double-ended zipper that can be locked in the middle to prevent items from falling out and to protect their safety. The smooth metal zipper is strong and durable.