The only real tip I have is that you have to be ruthless -- you'll probably never use those trinkets again, that Tier 0 armor won't ever really be needed anymore, and you might as well eat those Delicious Chocolate Cakes that you made for a rainy day. You might as well use those cooking and profession mats you've got sitting around now, because if they aren't worth anything at the moment, they probably won't be worth any more in the future. And yes, I know you've only got so much Noggenfogger left, but you might as well go ahead and drink it on the next fun guild run. It sounds harsh, but in a game that's really about collecting, we all tend to have a packrat side.
And if worst comes to worst, just create yet another bank alt, charter yet another bank guild, and start filling those bags up also. With all of the junk we've got coming through, they'll probably be full to the brim in no time.