Ok, thanks for the answer. It gives me an estimate: about 15 ounces, maybe more. I would definitively need to buy it online as this stuff is incredibly expensive at my craft store.
I definitely recommend buying online or from a local craft shop (not a big craft chain). I have tried a few sellers on Etsy and usually get my dyed wool in 1 oz bundles for about $3 to $3.50. The wool I started felting with was the Dimensions brand from Michaels and Joanns which was very tiny, expensive, and usually a little dirty/smelly compared to the stuff I get online. I recently bought a pound of cleaned, undyed wool roving from a fiber festival that I'm going to try to dye, and it was a lot cheaper that way. My plan is to dye chunks for trying more felting projects :3 (yet to happen a few months after purchasing though...)