I Got Reincarnated in Another World With My Backpack and Start Selling Tissue

The original title is meant to be "When I Got Reincarnated in Another World, I Bring My Backpack and Become an Adventurer, but I Got Bored so I Start Selling Tissue Paper" but Wattpad didn't allow it, so it's shortened into "I Got Reincarnated in Another World With My Backpack and Start Selling Tissue".
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A certain college student fell to a lake. He can easily save himself, but chose to sink in order to stay together with his backpack. Unbeknown to him, a goddess watched the scene and took interest in him. When the goddess offer him to reincarnate in another world, He ask her to modify his backpack so he can use it there. After becoming an adult, he decided to be an adventurer. but shortly after, he realized that it's not his forte, and so, he became a merchant.