Thirty-One Adjustable Sling Backpack Why you’ll love it: A new take on the traditional backpack silhouette, our Adjustable Sling Backpack lets you wear it on the left or right side by adjusting where the strap fastens. Ideal for hiking, camping, biking or travel, this sling pack features a zipper closure, two exterior side pockets and an exterior zipper pocket for all your essentials. Key features: Polyester Zipper closure 2 exterior side pockets Exterior zipper pocket Strap attaches to pack on left or right side for versatile wear Wipeable interior Approx. 12"H x 9"L x 4"D at bottom Great / excellent condition no signs of wear