I don't remember using these sandals for rain or snow. I've only used the sandals once. I think the bag is unused. The size is probably S. I had them made about 35 years ago. I've stored them in the top compartment of a closet for a long time. Shipped via courier service. I'm also selling other items related to Japanese clothing, so if you purchase multiple items, I can offer a discount on the combined shipping cost. Please take a look!