Organizing..

of course there is one crazy solution noone has mentioned......do your profession levelling now?
what I do is something like this

my enchanter is also my tailor so I de what I make
when levelling jewelcrafting I park the jewelcrafter and the enchanter next to each other at the gb and the jewelcrafter deposits the items in the gb and the enchanter takes them out at de's the items
it's quicker than doing a trade
for items that cannot be de'd or have some sort of value I park a couple of bank alts next to whoever and he fills his bags and sells them on the ah
also
if you're like me you're a hoarder of old gear, do you really need that cloth pair of pants you got from a quest when you were level 55? I cleaned out all my old gear that I knew I would never use again and made over a 1000g
and of course the really cheap option for 29 day storage is the mail, you can mail something like 12 items to an alt for 30 copper - that's damn cheap and you have 29 days to pick it up and you can just pick up 1 item from each mail at a time if you want to, a good example of that is incriptions, you make so many sorts to level and they take up heaps of room so mail is the way to go - a hell of lot cheaper than starting a new guild