This Refuge Runner Decoy Bag from Rig'em Right Waterfowl is the only decoy bag I've found that is designed for longer walks to the blind. The Refuge Runner bag has adjustable shoulder, hip, and chest straps, which make it much more comfortable than traditional decoy bags. The bag itself can easily accommodate 2 dozen decoys and had pockets for a Mojo, decoy stakes, and most importantly a pocket and strap to hold your shotgun. The bag holds most everything you need for your duck hunt, which allows you to have your hands free on your hike in.
It can be a little tricky to get on when it's fully loaded, and because there's no internal frame it doesn't ride as comfortably as a hiking pack. Still it is much better than any other decoy bag I've tried.
The Refuge Runner Decoy Bag has allowed me to explore new duck-hunting spots farther from the road and made the hike in a lot more comfortable.