2011io000oi via eBay offers this GSH 8-Liter Men's Military Shoulder Bag in several colors (Tri-Color Desert Camo pictured) for $8.99 with free shipping. That's tied with our October mention and the lowest price we could find today by $7. This waterproof bag features a ventilated back panel and an adjustable sling strap.
Note: It's available in A-TACS Arid for $7.99.
There are many ways to get cheap and even free services and goods after reaching a certain age.