Potato grow bag

I have been given a potato growing sack. Can you recommend a potato suited for its use?

Or if you like the excitement of not knowing... leave two or three smallest ones from a shop bought bag of tatties to sprout and bung them in (technique as above) - in 2010 I was very pleasantly surprised with how successful (and productive) that method was, albeit in the black flower tubs rather than grow sacks which should work even better.

piccie here

At the risk of promoting a deluge of "I prefer ..." I would suggest Charlotte. Its one of the most popular varieties, grows well in bags, and is a second early - so will only be about 12 weeks from plant-to-harvest