I got a free Island Mist kit because it was old. I can't decipher the code for an exp. date but the yeast was good till 4/10. I started it with 5# sugar added. I found that the F-pack has hardened chunks in it. They settled into the corners of the box and over the shapes under the F-pack. I can mash them with my fingers thru the bag so they are not rock hard. I was thinking of running it thru my food processor before adding it to my carboy. Any thoughts?