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When people open drinks，can, salad jam, etc. Always generated complaints. They think the cap is not easy to unscrew, especially for women, the children and the old who hands strength is little. To solve this problem, we design the new cap- BULGE, which different from the ordinary cap, it has a bulge on the edge. When people have drinks, can, salad jam, etc. they can use the BULGE to make unscrew the cap easily. It will be more labor-saving and care for vulnerable groups.