Looking for Answers about PETCO Petco Bags on a Roll Refills for Petco Bone Dispenser in Blue?

I can no longer find the black Petco bags in my store or on your website. They had grey pawprints and bones printed on them. I have tried your blue bags in the past and found them difficult to open and today asked a sales person at my local store and she agreed that the black ones are much easier to open. She said I could get them on your website, but I can't find them.

Your statement on the website is that the blue ones are now improved and better than ever. In what way? What did you improve? Are they finally easier to get opened up? I've had to mess around with the blue ones for up to 60 seconds in the past, just to open the bag, and switched to the black ones when they opened easily. I will be really disappointed if you've discontinued them.