This bag, from the 2008 Monogramouflage collection, which was designed by Takashi Murakami, was made most popular by Kanye West, who often carried this bag. Murakami had previously designed the cover of West's album, Graduation in 2007.  

Louis Vuitton Limited Edition Keepall Bandoulière 55 in Monogramouflage Coated Canvas, Takashi Murakami, 2008. Comes with dust bag.
Style/Serial Number: N/A
Date Stamp: MB1078

Detailed Features
22" L x 12" H x 10" W inches
Main textile: Olive and ivory Monogramouflage coated canvas 
Trim: Vachetta cowhide-leather and black webbing trim
Lining: Army khaki textile lining
Hardware type: Gold-tone hardware
Straps: Adjustable detachable shoulder strap
Handles: Dual top handles for hand carry with keeper
Interior details: Inside slip pocket, four small slip pockets
Additions: Luggage tag
Country of origin: Made in France