We have used the Montana decoy for several years now. several years in Colorado and last year in New Mexico. They work great. They are light, and fold up to almost nothing to fit in the pack. I have the broadside view and my son has the face on view. both work well but the face on view seems to give a larger profile. In New Mexico we had numerous bull respond to a cow call and walk right up to the decoy once they saw it. I would not be without mine in my pack!
I used to decoy turkeys pretty regularly when I lived in Texas. Seems like that worked off and on. I would have to admit that far and away, the biggest ones I ever shot were coaxed in with a combination of calling and decoying. Same maybe true for elk? I'll have to try that when I can scrape together the cash. I currently have 2 little ones in diapers.
I hunted with a guy that used the backend view decoy. We really didn't get an opportunity to use it on Elk, but it was great for giving deer a security feeling. They would trail past it without looking tense. As for carring it, it works great to break up the day. Slipped between your pack and back, it pops out at the most crazy times and when you forget it is there and the pack comes off... constantly provides an adrenalin rush.
What do you do with those empty nylon feed bags or dog & cat food bags? Can you say recycle? I use them for target practice for the youngsters. Take your empty shopping bags, stuff them into an empty nylon feed bag. You can also use old clothing or rags, (but put them in the bottom so it doesnt get top heavy). When your bag is full, fold the top over, punch some holes into the top and zip tie the top shut. Paint, draw, paste, or have the kids decorate their new target. Set it out 10 or 20...