TomTop offers the Free Knight 40L Hiking Camping Backpack in Black or Army Green for $12.99 $13.99 with free shipping. That's the lowest price we could find by $21. It features several pockets, adjustable straps, and water repellent nylon material.

Note: This item ships from China and requires two to five weeks for delivery. The countdown timer on the product page does not reflect an actual expiration time and resets daily.