Abstract: A mobile phone strap for reducing disposable vinyl includes a strap and a portable bag. The strap includes a mobile phone fastening part, a strap opening/closing part, a strap interior, and upper and lower straps. The mobile phone fastening part is fastened to a back surface of a mobile phone to fix the strap. The strap opening/closing part includes at one side an opening/closing lower part through which the upper strap and the lower strap is opened and closed. The upper strap and the lower strap of the strap are coupled to form a space in the strap interior. The portable bag is disposed inside the strap interior. The portable bag can be taken out to be used for storing items, so that the consumption of disposable plastic bags can be reduced by replacing the disposable plastic bags with the portable bag.