how can I cold storage IOTAs?
Remember your seed. That's all - so simple

Will we ever be able to use more than 81 characters for our precious seed?
Dude, do the math. How many possible seeds exist with 27 chars, 81 length?
SO umm, yes then?
My point was: Noone will ever need a seed longer than 81 chars.
Hmmm. Some time ago I was told:
"No one will need more than 637 kB of memory for a personal computer"
Is it possible to increase computing power as fast as memory size? na
At that time we had single processors without math coprocessors and round about a maximum of 40 Mhz. So it actually relates.
But I guess we still have many years of time.