What is the width of the opening of the 1.8L bottle? Lucy November 12, 2020 15:19 Updated The inner width of the mouth of the 1.8L bottle is 4.7cm and the outer width is 4.9cm. Please see diagram below: Related articles What are the sizes and weights of Chilly's Bottles? Why is my Chilly's Bottle rattling? How best to use my Chilly's Bottle? Are Chilly's Bottles leak-proof? Can Chilly's Bottles keep drinks hot? Comments 0 comments Article is closed for comments.