I'm kind of surprised that more manufacturers don't make them or that HF doesn't carry a cheap Chinese-made version.
I'm surprised too. I ended up buying two of these when they were on sale:
<img src="http://www.harborfreight.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/i/m/image_20481.jpg" width=50% >
http://www.harborfreight.com/100-piece-security-bit-set-68457.html
I kept the security bits in one kit and dumped the bits from the other kit into an altoids tin for use when I loose or break one of them in the first kit. Once the second kit was empty I filled it with standard bits and marked it with a sharpie to make it easier to ID the two.
It's not a perfect solution but was cheap and easy. I now use these in my car tool bags. For my shop box I bought a few of these on sale:
<img src="http://www.harborfreight.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/i/m/image_13781.jpg" width=50%>
http://www.harborfreight.com/33-piece-security-bit-set-93388.html
again saving the duplicate security bits for replacements and using the empty holders for standard bits. With the tops off these make the bits more accessible in the drawer.
On a related topic, a few years ago I bought some 1/4" hex bit to socket adapters from HF that I use with my Bosch impact driver.
<img src="http://www.harborfreight.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/i/m/image_20482.jpg" width=30%>
http://www.harborfreight.com/3-piece-hex-drill-socket-drivers-68513.html
It pissed me off that these didn't come with a holder as the three adapters were always getting lost in my tool bag. Recently I was in HF and see they now sell that (or a similar) set with an included flexible plastic block to hold the set together. That was worth buying another set for $3.
I noticed that several of their new screw bit and nutdriver sets include a similar flexible plastic storage block. I think this same block can be seen in 84TubroBuick's post above on the set of color-coded long hex bits on top of the green box.
If only they would sell larger sized versions of these separately. The flexible material grips the bit tightly but still makes it easy to pull it out.
I'd like to get something similar to hold these hex-shank drill bits that go in my toolbag:
<img src="http://www.harborfreight.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/i/m/image_18340.jpg" width=30%>
http://www.harborfreight.com/13-piece-titanium-nitride-coated-drill-bits-1800.html