Info: MG 1/100 Universe Booster

Universe Booster is an additional backpack for Build Strike Gundam to replicate Star Build Strike Gundam which featured in Gundam Build Fighters anime series. This add-on can act as an independent fighter and will be released by Bandai on March 2014 with the price of 2,940 yen (tax included).

Inside the box: Plastic runner sets (x5), sticker + decals (x3), manual assembly book (x1)

MG 1/100 Build Strike Gundam sold separately.

MG 1/100 Universe Booster

MG Star Build Strike Gundam (Rear view)

Sources:

http://www.1999.co.jp/10255349;

http://www.aemedia.org/2013/12/mg-universe-booster.html