Large, boldly colored bag unzips and unfolds to become a comfy 23" x 67" beach mat with inflatable pillow. Made of tubular, woven polypropylene material, it’s water- and sand-resistant. Front slip-in pocket stores key, sunglasses, iPod and more. Main compartment is great for books, a change of clothes and a towel. Easily folds and zips back up into a bag with 30" web shoulder straps.