student backpack 1. free sample 2. conform EN-71 and ASTM-D4236 3. custom design and logo printing are welcome student backpack: 1. packing: 1pc/opp bag, 30pcs/ctn2. promt & accurate communication3. competitive price4. conform EN-71 and ASTM-D4236, quality confirmed by clients5. delivery as agreed6. custom design and logo printing are welcome7. free sample. student backpack