Rav Nachman maintains the quantity of leather which is not intended for tanning is identical to the one slated for tanning ‘kedai lasos kamiya’ – which is regarded as a significant shiur for the melacha of tanning itself; thus indicating that a tanned piece of leather of this dimension carries significance. But why should the one that will not be processed have this same shiur?
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Once an item’s standard usage is established, that is the Shiur, regardless of your particular intention. This size is considered a significant enough size of this item to be reckoned with.