39L Large Capacity Men Backpack Extension Business Laptop Backpack Waterproof Travel Bag school Backpack for outdoor backpack

Product name: laptop backpack
Material: Oxford cloth
Weight: about 1.5KG
Capacity: 39L=20 inch suitcase
Size: 46*30*18CM
Purpose: travel/business/school/work/travel/climbing
Features:
1. Large capacity: can hold items for 5 to 7 days
2. Dry and wet separation bag
3. USB charging
4. High quality waterproof
5 can be inserted into the suitcase
6, 180° open way
7. Expansion backpack
8. Comfortable and breathable back
9. Decompression shoulder strap
10. Honeycomb back pad
11. Can be expanded to 39L
12. Environmental protection
13, wear-resistant
14, waterproof
Breathable and lightweight design