Are you planning on placing on a picket line or inside a pen/stall?

For stalls/pens I prefer the Classic Equine top load hay bag. You can easily stuff three flakes and the multiple holes allows the horse to comfortably eat the hay. Here is a link to a picture - you can probably find them cheaper somewhere else as I paid $20 at a local feed store. http://www.valleyvet.com/ct_detail.html?pgguid=93e6d305-667b-4ca1-a0b6-2f9cf3b81e43

For picket lines, we used the heavy cotton rope hay nets and secured both the top and bottom of the bag to the line... kinda looks like a hay hammock. This helps prevent feet possibly getting tangled in the bag. The heavy rope hay nets hold about three to four flakes of hay too.

Have a great time in the black hills. That is on my list to visit someday.

Does anyone know of any hay bags that you can zip up so nothing falls out of it? I'm going to go fishing and the only way to get to the fishing hole is walking, biking, or riding horses. I wanted to take some hay so I can leave really early and my horses can still have there breakfast. I have been looking for a long time and it would just be a lot easier to ask someone. Thank you.

I'm not quite sure your intent. "Nothing Falls out"  As the horses pull the hay out, you will always get some waste that ends up on the floor. It falls out as the horses pull the hay out. Hay nets will loose more than hay bags, Due to their open net design. Some folks like that so their horses don't inhale the smaller particles and develop lung problems. Others prefer the closed design because there is less mess. 

From your comment of leaving early to go fishing, I assume you want to feed the horses as you drive to the trail head.  Hay bags should work fine for that. And what little that falls out isn't a big deal on the trailer floor. It just mixes in with the shavings. I have also used some corner feeders that were made out of heavy vinyl, canvas type of material. The most recent set did not hold up well for me. The horses pushed on them and the grommets pulled out and corner bags ended up on the floor. But an earlier set I had made of balistic nylon held up well for 5 years.

If I need to haul feed into the back country, I wouldn't bother with baled hay, unless you had an extra pack horse.  Fill a saddle bag with some pellets and take a nose bag that you hang on the horses while you fish.

Most of the time I just hobble the horses let them graze while I eat lunch or while I fish. If I do bring a nose bag, I fill it with grain and use it to catch reluctant horse.  They soon learn that the hay bag has grain, and come when I shake it, Just like a grain bucket at home.

Here they graze with hobble while we eat lunch.

Here they graze with the saddles off near camp,

You will get used to your own horses. I know mine will graze for about an hour before they start looking to get into trouble.

When I see them with their heads down, I don't worry, But as soon as I see them with their heads up and looking around, It's time to collect them are tie them to a tree.

My horses can run faster in hobbles than I can run. But they tire quickly and won't go far in hobbles. I almost always carry a set with me when trail riding. I just slip it through the Dring for the rear cinch and let it hang along side the rear or flank cinch.

If I have given them a decent meal in the trailer ride over in the morning and have hay in thr trailer for their ride home. A little snacking mid day is all they need.

Chicks Saddlery has these for 8.99 now....I got the canvas ones

Canvas Hay Bag		$8.99
TMB851	Nylon Air Flow Mesh Side Hay Bag		$8.99

My paint does that too! He isn't hobble trained yet but I have to put an extra chain on every gate to keep him in. He doesn't really go anywhere but to graze in the yard though. I think he just gets bored and getting out is fun.

I never would have thought of that. Thank you. And that is a very beautiful place! I bet it's awesome to ride there.