Instant purchase OK The outer fabric is waterproof cotton fabric from Decollections. The lining is a washable thermal insulation sheet (pink). It's flat, so it's easy to carry in your bag. It also fits easily into your child's school bag. Neck ring (images show M and S sizes) Fits 200ml juice boxes Also fits jelly drinks. Size: Width: 21cm Height: 20cm No gusset Uses a 20cm zipper This is a handmade item by an amateur. There may be some slight variations. For bulk purchases, we will discount 50 yen from the second item onwards. We will fold it for shipping. Thank you for viewing.