Guys, guys, it's NOT possible to accidentally short AA/AAA batteries as the terminals are so far apart! Those proprietary LiON ones are more suceptible but even then, they are not so easily accidentally shorted by leaving it in your pocket/bag, etc.
For AA/AAA batteries, simply bundle them up using rubber bands. Worked well enough for me for years. Otherwise, you can try the packaging of the Engergizer Titanium AA batteries.
The main purpose of me having camera case/holder is because I have different mix of batteries of the same brand, such as 1600, 1700, 1850mAH.
Though not really a need to do so, I just want to keep those of the same together, and also, I don't have to spend time digging and searching for the same type when all are mixed together. Lastly, it's easier for storage purposes.