I gave my parents a few of my left over seed potatoes from last year (i ordered far too many as per usual), my Dad refused to put them in his veggie patch so they used empty compost bags. Worked a treat and although i don't know how many kg's they got they were very happy with the yield.
I'm going to try to grow some potatoes for exhibition this year so have ordered 10 x 36 litre 'potato growing bags' from T&M, they were only £7.99 which seemed fairly reasonable. They suggest 2-3 tubers per bag, depending on variety. The remaining tubers (of which there will be lots - i've overordered again
) will be going in the plot - hopefully i'll get a better yield this year.