2012 hot back pack 1.12 years experience of bags 2. best quality Lowest price 3.OEM is warmly welcome 2012 hot back packback pack 1.About Products Efficacy Front One outer bag ,One Main Bag. Inner One zipper inner pocket two Small pocket(put books, documents and mobile phones,etc). Side Two high capacity side pockets(can put kettle and pencil ,ext. Back Streamline strap ,Health cooling type back- ...