Lens cases
I've pretty much settled on the Lowepro line of lens cases—they're well made, padded, zip nicely, and have a solid back attachment that can work with belts, etc. Good size range, too, and at a fair price. But even their smallest cases are too big for small lenses. (Good fit for the 14-140 with lens hood reversed on it, for example, in their smallest (or maybe next to smallest) case.) These really are stand alone cases, as opposed to pouches, which would be better (take up less room) if you were putting lenses into a pretty secure bag, but wanted to keep them separated.
I got an Optech accessory case a few weeks ago; they come in two sizes. The small one (5 x 8 x 2 approximately) holds six small to medium (for m4/3) lenses! Well protected from each other, and readily accessible when you unzip it. (Or could be two lenses and a bunch of smaller accessories, whatever.) This is a great way for me to have them all in a pack, and just grab the whole case, unzip it, and there they are for the picking.
Here's a link to the Optech cases:
http://www.bhphotovideo.com/c/product/387552-REG/OP_TECH_USA_4901002_8_0_Accessory_Pack.html