It can hold slightly larger PET bottles, up to 500ml. It's made to perfectly fit the size of a PET bottle (＾ω＾) The lid is frilled, and when you tighten the strings on both sides, it creates a cute design. ● Bottom & Frill: White 100% Cotton ● Sides: Blue 78% Cotton, 20% Polyester, 2% Rayon The material is a bit stiff, but it will soften with use(^^) Each one is made carefully, but as a beginner, there may be slight variations in stitching and size. Thank you for your understanding. #handmade #petbottlecover #knitting