Amazon.com has Laptop Backpack with USB Charging Port on sale for $29.99 – 40% off = $17.99 via Code PPB7ACDC . Shipping is free .
https://www.amazon.com/dp/B01LL7TLIM
- Approx Dimensions: 19.68 x 13.3 x 8.4 inches; Capacity: 37L; can hold up to 15.6 inch laptop; also has a smaller pouch for iPad