A long time ago I recall seeing a really cool dicebag. I don't remember if it was in Dragon, online, or what.
But picture this: Take a normal dicebag, and make it so that it can be opened to the point of laying flat. Then add pockets to the inside of the dice bag, so that you've got the bag itself and then several sub-compartments there-in. Finally, the bag may be reversed, leaving the pockets around the outside.
Doesn't seem particularly functional to me, but it's really freaking cool. Wish I'd gotten one of those. :/
I have two dice "bags." My main dice bag is a small black velvet bag with a silky red interior and red braided draw string with tassles. I keep all my dice which are red or blue in this bag, my personal "color scheme."
My other "bag" (hence the mysterious quotes) is actually a box; a large d6 about 6 inches on a side, with a hinged, magnetically-sealed top. I keep all my other dice in there as table dice.
Anyone may use the table dice, no one else may touch my dice!
I used to keep all my dice in a much larger, light-tan leather bag with leather drawstrings and a small dragon printed in black ink on the front, which I affectionately called "The Goat-Scrot." However, when I decided to downsize to just my favorite dice, I put the goat-scrot away. It was a great bag, served me faithfully for many years, held a king's ransom in polyhedral dice, and the natural friction of leather-on-leather meant the draw-strings kept the thing closed very securely.