Swiss Gear Blue Computer Backpack SA3186 Shoulder Strap System - Egronomically contoured straps are made of padded, breathable fabric. Air Flow System - provides extra comfort and maximum back support. Water bottle pocket/ Organizer Pocket/ Phone Pocket Audio Interface - Interior MP3 pocket with built-in external headphone port. Shoulder accessory loop - handy loop tab for sunglasses or other needed items.