Uses a 20cm zipper. Return: 21cm Shoulder strap length is adjustable with a hook. Popular and trusted Kawashima textiles. Also uses the popular William Morris Strawberry Thief fabric. We also paid attention to the snap hooks, using brass ones. To prevent the shape from collapsing, a triangular plastic plate is inserted in the bottom. This is the piece that cost the most in materials, but because of its unique shape, I thought it might not be for everyone, so I've priced it affordably. Thank you very much!