Similar to the shotgun here is my "finished" backpack (it's never truly finished...). For some reason I did most of the texture painting in Zbrush and got a lot of neat effects doing it. All of it was sculpted in zbrush and tidied up the textures in photoshop/mudbox. Also, I added buttons, because they look neat and give her more personality! The backpack is around 900 tris and uses one 2k texture (along with all the other accessories)
Here it is (again excuse the crummy gif -- im working on it...):
Direct Link: http://i.minus.com/ib0hrqjZfOFHFp.gif
And here are some images: