I use a fanny pack. It is also a hand warmer. It has three pockets so I can seperate the different components that I need to haul out into the field and know right where to look for them.
You want a cheap possible bag. Take an old pair of blue jeans. You know after you wore the knees off them for the 5th time. Cut the legs off them near the bottom of the crotch, and double sew the legs shut with a strong quality thread. I used cat gut. Then fold them in half like you were going to put them in a drawer. Sew the bottom of the legs together and the side of the open seam up. Now you have two double pockets large enough to haul anything, plus smaller outside pockets for your primers, jags, etc. On the legs you cut off, take the side seams, sew them together, and then make a strap out of that. Sew that to your main pouch and you have a cheap homemade possible bag. A rope through the belt loops can be pulled together and tied to close the top of the bag if you like. They will get you by until you can purchase a PC one that will not do as good a job for you...