noun
outer lid
Refers to the outer lid of a container, often contrasted with 内蓋 (inner lid). Common in contexts like bento boxes, tea ceremony utensils, or storage containers.
See also: 内蓋
この弁当箱は外蓋と内蓋が付いています。
This bento box comes with an outer lid and an inner lid.
外蓋を開けると、中には仕切りがあった。
When I opened the outer lid, there was a divider inside.
内蓋 is the inner lid, while 外蓋 is the outer lid. They are often used together in multi-layered containers.
Compound of 外 (そと, 'outside') and 蓋 (ふた, 'lid'). The reading そとぶた is a straightforward combination of the kun'yomi readings of the two kanji.