The Eastport Protection Ergo Sling Backpack in Graphite Gray is a medium-sized backpack made from water-resistant polyester material with a solid green color. It features a zip closure, adjustable strap, and various pockets including an inner pocket and a bottle pocket. The backpack is designed for unisex adults and is part of the Protector sling model, providing both style and functionality for everyday use. With a durable canvas fabric type and a polyester lining, this backpack offers a comfortable and practical solution for carrying your essentials.