Football Fanatics NBA Boston Celtics Youth Black Southpaw Backpack Fabric Carrying your belongings is more fun with this NBA backpack by Concept One. It's made of 600D nylon with 840D nylon accents and a felt team logo appliqu on the front. The adjustable padded shoulder straps are designed with a cell phone and MP3 holder. Inside you'll find a front pocket organizer with a key ring holder and CDMP3 holder with a headphone port on top, so you can easily listen to your favorite tunes.