I keep 2 sawzall blades (think they are 6") in my psk. I use black electrical tape to protect the teeth, and then you can use that same tape for a little 'handle' if you need to use the blades asap. Using this method reduces the cutting part of the blade. I've done this for cutting thru copper pipe as a test and it worked.

They take up no room other then the length. And if needed, you can create a handle for it...

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"One should not increase, beyond what is necessary, the number of entities required to explain anything"
William of Ockham (1285-1349)