I have four VITA/PSTV memory cards.  Currently, I have my 16GB card in my PSTV, and I hope it's the last one I'll have to buy.  I have two 8 GB cards and a 4 GB.  For the most part, I find them useless.  But do you find yourself switching out cards because of lack of space?  I wonder if it's worth selling the 4 and an 8 or should I keep them just in case I might need them.

Bumper.

External hard drive, why do u have Vits tv?

A PlayStationTV.  One of these things:

It's like a Vita, but you play your games on the TV instead.

Then again, it seems like no one cares anyway.  :p

There are also 32 GB cards available as far as I know. IMO sell the lower capacity ones and buy a 32gb one. They are fairly cheap these days.