I did a couple batches of venison sausage for my neighbor this weekend. One was a 25# batch of snack sticks. I bought my 21 mm smoked snack stick collagen casings from my usual supplier, a local specialty butcher. Have had great success with them in the past. The casings seems different from the moment I saw them. Lighter color, generally lighter, thinner feel. I went ahead with them anyway, started stuffing and just as quick started blowing casing within the first 6 inches. Very dry and brittle texture, collagen are usually dry, but these were onion skin. I put em on the double boiler to get a little moisture into them, and this helped enough to get the job done, but I couldn't stuff them too tight or they would blow again. They stix are very loose and wrinkly, not what I usually end up with. Not sure what the main problem was, the brand, my storage or use, just not sure. Not a fun session.