In my backpack I have a......

 A small bag where I put either the DS or 3DS XL backpack although I have also large compartment for either consoles.
A red box where I put the DS XL
A card reader for Micro SD
Nintendo DS XL
3DS
3DS Base
A single charger for the 3DS and XL
Silicon Case for 3DS
3DS Cartridges
A pair of headphones for what they are lost ones (always lost XD)
an LED lamp
250Gb external HDD shockproof
A mini triple for the camera
The loader of the House
Case for storing the camera
iPhone
laptop
Neoprene Case
Cable for iPhone
retractable mouse
Charger from the laptop (I have a carry case)