This chest bag with multi-functional space planning, the main bag has a mezzanine, space more flexible, items can be classified storage, there are convenient front backpack bags, and other small items can be placed on emergency response, coupled , so that the chest is more stylish package. High strength PP chest flexible adjustment package location, greatly improving user comfort. Chest top package for the expansion space mode, greatly improving space utilization chest packs, use of a cotton / cotton thread carefully sewn, with high-quality stitching and ribbon play dates, very durable.