This item has been stored for about 20 years after purchase. It is unused, but it is old. The size is indicated as "20" on the tag. I read online that size 20 varies depending on the manufacturer. The AI's answer is 3L to 4L. Please refer to the photos, which show a measuring tape. It is a large size. Caution ⚠️ I recently found this in the closet. It hasn't been long, so it has a peculiar smell. Please refrain from purchasing if you are concerned.