Please choose the correct solution to the question: How can you double your zip loc bags?

Solution1: Heat up an old butter knife with a lighter and slice the bag in half (so that only one side has a zipper part) the hot knife cauterizes the edges of the two new bags. The cauterized edges are as strong as the factory sealed edges!

Solution2: Heat up an old butter knife with a lighter and slice the bag in half, (so each side has a zipper part) the hot knife cauterizes the edges of the two new bags and the cauterized edges are as strong as the factory sealed edges!

Answer format: solution1/solution2
Answer: solution2