One side of the strap can be detached, allowing you to hang it on a bar or similar. I crocheted it with a cream-colored cotton yarn (95%) with a slight sparkle, suitable for spring and summer. The photo shows a 600ml plastic bottle inside. Hand washing is possible. It does not have cooling or heating functions. The size when laid flat is: Height x Width = Approximately 19 x 11 cm Diameter of the base: Approximately 7.5 cm The length of the strap is approximately 25 cm. Thank you for viewing.