Hi all.. Received my Fansproject Thundershred today (which is awesome!) and was messing around with him and noticed that the space on his back looked perfect for my Perfect effect shadow back pack... and yes... it fits! It's held nicely in position by the insect legs on his back, and the 'cockpit' part folds down over it. Looks pretty hardcore with his additional firepower! Have ordered the other shadow warrior dude to complete the effect. Check my pics.. sorry they're a bit ropey.. took them on my phone. I'm sure someone else has already discovered this groovy combo, but thought i would share anyway! Cheers.