I have used my Revolution Bag
for years. They are great bags, and will last a good long time. The internal frame has worn holes through the bottom of many of my friends bags, however. If you get one I might try and figure a way to pad the bottom of the frame to try and prevent this from happening (while trying to avoid things that would stay wet and mold).
An old friend of mine owns this company
. I have not gotten one of his bags yet but have used his straps since I since I started competing, they are a staple for most serious disc golfers. A few of my friends have his bags and they love them. There is an option to get the bottom of the bag line-x truck bed lined which adds serious durability (and only a little bit of weight).
There was a bag I saw at pro-worlds this year that was just sick if you carry a ton of discs. I don't remember the name (fail), but you probably could find it if you look hard enough. It had expandable sections on either side, and internal frame like a serious backpack, and the couple of guys that had it were extremely happy with its performance. Drawback: I believe it had a cost of 225-300 dollars. My jaw hit the ground when I heard this, but as I said it seemed to be an amazing piece of equipment.