Lowepro Orion Trekker II Camera Backpack -Black Orion Trekker II Capacity: Digital or 35mm SLR with attached zoom lens; 2-3 lenses; Lots of extra pockets for storing Digital Memory, extra batteries, and other accessories Headphone cable port allows you to listen to your MP3, Mini Disk or CD Player while carrying the Orion Trekker II on your back. Bottom camera compartment is fully customizable for your SLR or Camcorder system, and is removable SlipLock attachment slots allow you to attach additional Lowepro accessories and pouches to the Orion Trekker II.