As one of its daily deals, MidnightBox offers this Large Military Tactical Backpack
in Jungle Camo, model no. OU00069, for $19.95
for shipping. That's the lowest total price we could find by $16. This 18" backpack features a padded back panel with built-in ventilation channels, multiple compartments, water repellent interior, padded hip belt, adjustable shoulder straps, and top "hood" cover with MOLLE loops. Deal ends December 19.
Note: It's not guaranteed for delivery by Christmas.