I use a small zippered belt pouch for a one day hunt, but never expect a quick second shot. Never needed one anyway.

Here's my pouch set up for my .45 Renegade with the Green Mountain Long Range Hunter barrel.

It contains:
3 Lanes tubes with powder.
1 Tube with bullets in sabots.
1 Tube with caps.
Short starter.
Nipple pick.
Pipe cleaner.
Allen wrench for clean out screw.
Cleaning jag.
Patch worm.
Screwdriver.
Alcohol swabs.
Small plastic box of cleaning patches.
And still has plenty of room for a couple of folded up paper towels for wiping my hands (or other parts of my body).