The left side of kfc picture is correct because there is sauce in kfc chicken rolls. Sealing one end is to prevent the sauce from flowing out when the other end is down while holding it. The one on the left is different. One end is rolled up and easy to open, and the other end is folded back and sealed, which will seal the sauce. When holding it, the left end is up, open the rolled seal and tear it as much as you eat. This is convenient and hygienic, and the sauce will not be poured out to stain the clothes.