Running Out Of Room - Where To Keep All The Things

We've talked about investing a lot these past weeks. It's one of the best ways to make money in game and we've been looking at current events and events to come - so it's only natural. The right investments are cheap, with a great profit margin but they do come with one downside. 
Space. Guild Wars 2 is a bit unique among the top flight MMORPGs in this regard. Your bank and your backpack are all limited by microtransactions. 
You know the scenario well I imagine. You have 1 inventory space free between bank and bags and you really need to cut out some junk but you have no junk - just alternate gear sets, items you want to keep and investments for the future. At this point a lot of people might be tempted to cut their projected profits and sell stacks of items at a sub par price. You don't have to do this!
I know a lot of you won't want to spend on gems for bank space or backpack slots and that's something we'll look at later in this post. First of all I want to share a few tricks with you - ways to maximise your space without spending real money. 

First of all, think larger bags. They're an investment and I'm not suggesting 20 [11g+ each] or even 18 [2g+] slot bags (thanks to the runes required these aren't even cheap to make yourself) but 15 [60s+] and particularly 12 [20s+] are cheap to get. You'll be amazed at the difference this makes.
Next up mules. Not donkeys, no. This is maybe an idea that's new to some but I'm sure it's familiar to the majority that read this site. You create new characters, buy them enough bags, ideally 10 [5s+] but 12 or 15 won't go amiss either (see above). 
Spare characters = free inventory slots (without paying). Because your bank is account bound, you can empty it into one mule and use the bank as a trading station between your mules. This is excellent and (as those of you who had mules in other games know) makes things so much easier when you have an item on one character you need on another. 
My final space saving tip for today is a bit more difficult but not beyond the reach of a regular gamer: guild bank space. Again Guild Wars 2 throws us a bone here (even if the microtransaction system is why we've got to try these workarounds in the first place) - you can have a guild just for yourself and still be in a dungeon/wvwvw/spvp guild at the same time. 
You've got to muster up the IP for the necessary architecture level and then for the first stash (and if you want more you have to keep going) and it can be slow, but it's not insurmountable. 
Now let's look at actually paying for more space. Should you? I have myself in multiple ways and this is what you have to weigh up: 
Extra bag slot = 400 gems (max space depending on budget but between 10 and 20 slots) Extra bank tab = 600 gems (30 slots) Character slot expansion = 800 gems (space depends again on bags to an extent but you've 20 slots in your main back pack and then between 10 and 20 slots in each of the 4 bag slots you get)
For my money, a character expansion slot is the best bet until you reach the limit. You can get 60 slots for 800 gems and <20 silver. That's 2 bank tabs (1,200 gems). 
If you're really flush with in game gold, that character can get up to 100 slots of free space. Talking about being flush, even if you are you need to weigh up the gem > gold conversion rates. It may be that that fancy 20 slot bag you want is worth more than 800 gems for a new character slot (and at least 60 slots). 
What other space saving tips do you guys have? I'd hate for anyone to feel like they have to give up on an investment for space related reasons alone!