This is a crocheted bottle holder made with yellow and white yarn. I think you can use it to hold plastic bottles, water bottles, etc. I crocheted it with 100% cotton spring/summer yarn purchased from DAISO. It is hand-washable. It does not have heat retention or cold insulation functions. The photos show a 600ml plastic bottle and a 0.48L Zojirushi water bottle inside. The size when laid flat is: Length x Width = Approximately 18 x 12 cm Handle length: Approximately 24 cm Diameter of the bottom circle: Approximately 8 cm Thank you for looking.