Pack some small maintenance knowledge.
1, different colors of backpacks, do not close in the wash, so as not to stain.
2, backpack fabric and metal ripped beyond repair to always prevent touch sharp objects, and should be taken to avoid contact with the chemical.
Lump sum 3, keep back cool if bag is wet or damp will cause deformation.
4, not smooth (patent leather) Pack into plastic bags prevent adhesion.
5, do not let the backpack load is too heavy for casual backpack (weekday backs), with a maximum 4-7 weight can jins, overweight leads to wrinkling, distortion, cracks, or even fall apart, then falling apart is a little embarrassing.