I haven't tried a sling; most of my bar cookies are baked in 9 x 13 pans, and I don't think the sling would lift them without bending/breaking. But I did want to mention one thing. I see that for your examples, you show the sling, but two sides of the pan are bare of parchment. Why? I regularly bake your fudge brownies and chocolate chip cookie bars in 9 x 13 pans that are totally lined with parchment. I just miter the corners--clip at a 45-degree angle down the corner and let the two parchment sides overlap, then press into place and clip. I use binder clips on all four sides of the pan. Even with the miters, I rarely have to wash pans, sometimes just a bit in the corners, and the bar cookies come out perfectly.

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