I'm big on the tubes as well, for the organizing and auditing reasons given already by others, not to mention the fact that they are useful--or even required--for some games; e.g. "barrier reefs" in Armada, the "golf club" in Penguin Golf, the "Moon's gravity well" in Moon Shot.
That said, a combination playing board and drawstring bag *is* very clever. Perhaps you could use the reinforcing second fabric layer/backing for another board layout--say, three-way or five-way Martian chessboard--rather than using plain fabric?
For my own storage, carrying, and demoing purposes, however, I have found this particular case-binder to be PERFECT:
First, it is tall enough to hold 11 tubes, with just the tiniest bit of "shift" of the 11th tube.
Second, once the tubes are laid flat in the case, there's about 3/4" of additional thickness and about 2-3" unused on the side. Enough to hold a set of Martian coasters including the black one, 6 laminated Eeyore tri-boards, 2 bandana chess boards, a Volcano board, a crackled CD, Playing with Pyramids, a printout of 18 more games, a small Crown Royal bag containing about 80 Zendo stones, 10 poker chips marked for Homeworlds, a Morgan-Greer Tarot deck, a pen, 6 dice, and a small stack of mini-catalogs. In short, I can play just about every pyramid game on the wiki by carrying around this one case-binder.
Third, the clip on the cover of the case-binder is great for holding a few catalog brochures or a piece of paper for tracking tournament or demo activities.
Hope this helps!
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