noun
paper containers; paper articles
Refers broadly to items made of paper, especially containers such as boxes, cartons, and packaging.
この工場では紙器を製造しています。
This factory manufactures paper containers.
紙器は環境に優しい包装材として注目されている。
Paper containers are attracting attention as environmentally friendly packaging.
Compound of 紙 (paper) and 器 (container, utensil). The reading しき is the on'yomi of both characters.