not an issue, a question.

he's at work (sunny) and goes to shop (rainy), bringing the umbrella. He leaves it at the shop because it's sunny at the work again, and then he comes back to the shop which is raining - thus requiring it to pick up a new umbrella once again

When the wanderer comes back to a place, he can re-use the umbrellas that he left there before. He left an umbrella at the shop earlier, so he can re-use it now instead of picking up a new one. (Very nice of the shop-keeper to store this guy's umbrellas)