What size is a cot bed flat sheet? Rebecca L September 18, 2020 14:19 Updated Follow Our cot bed flat sheets measure 120cm x 170cm. Shop cot bed flat sheets. Related articles What size is a cot bed fitted sheet? What size is a cot bed duvet cover? What size is a single duvet cover? What size is a double duvet cover? What materials are used to make our French bed linen and what are their benefits? Comments 0 comments Please sign in to leave a comment.