Had a fishing tackle bag that I thought would make a good shooting bag but with some mods made to it. I liked the way it would hold 4+ boxes and separate compartments for glasses and such. And even a place for folded up shot boxes or shoot programs. Only thing it needed was a top zipper which my wife who is a professional seamstress could easily do. She also fixed me up a shooting belt that holds a box of shells and empties including a zipper bottom to drop out shells. There is a semi circle loop at the top for easy access.
I use a tackle bag as well...tromped all over the Cardinal yesterday, carried all ten boxes of ammo plus everything else you would expect for a full day of registered shooting. I've been carrying this for a couple of months of shooting several times per week and it's not showing any signs of wear so for less than $20 I'd say its so far so good!
wadhopper all you need is a big hat for them rainy days of shooting. they work, mine keeps my glasses dry.