Thank you for viewing! This smartphone shoulder bag does not have a detachable strap, but it comes with an adjustable shoulder strap. Made with PP tape, it's durable. The front pocket has a zipper, so you can safely store keys, coins, etc. Width: Approximately 13 cm Height: Approximately 20 cm Strap: Adjustable length, not detachable Pocket: 12 cm zipper. Inside: Magnetic button Please understand that this is a handmade item, so there may be slight measurement errors or stitching irregularities. Thank you for your understanding before purchasing.