I went to a potluck on the weekend & I didn't have a casserole carrier so I wrapped the casserole in a towel. A lady at the potluck brought her casserole wrapped in a carrier that looked really easy to make. On Saturday I made 4 of these in 2 different sizes (18" square & 20" square). Didn't need a pattern, just cut my squares for front & backing & insulbrite, bought 2 D-rings & went for it. After you lay your dish in the center you thread the strap through both D-rings & pull the strap tight. Easy peasy!