If your searching for equestrian styled packs for your outdoor adventure you may wish to review the Horse Equipment found on the Mountain Ridge Gear website. There are Saddle Bags, Panniers, various Pouches, and other Back Country Equestrian Gear.
The Saddle Bags are made with sturdy 1000D Cordura fabric and other American made materials. They are sewn in Peyton CO. and have a total carry capacity = 1362 cubic inches; hi vis material is available (blaze orange or florescent pink).
The Panniers fit any size equine and different sizes are available; they range in size from 15″ x 14″ x 7″ (38.5 x 36 x 17 cm) to the Extra Large 26″ x 18″ x 12″ (66 x 45 x 58 cm) = approx. 5616 cu. in. of space. The Panniers also have 1″ x 1/4″ lightweight and strong, removable aircraft aluminum stay rods that are great for hunting and heavy packing hauls.