I handmade a shoulder strap for a Thermos vacuum insulated baby straw mug (model number FJL-350). I also have blue, pink, yellow, brown, off-white, and gray colors available, so please check my profile (some may be sold out. If you request a color in the comments of a listed item, I will make it for you). *Strap only, mug bottle not included. When you have children, you often have a lot of luggage. A shoulder strap for a straw mug is very convenient for carrying it around. While the official Thermos cover cannot be used as a shoulder strap, this product allows both children and adults to use it as a shoulder strap by adjusting the length of the belt. It's very easy to attach and detach, just use Velcro and pass the D-ring through the handle. I didn't want to cover the non-slip bottom, so I made the belt only for the upper part. My grandchild requested that they be able to carry it from the nursery, so I completed it after much trial and error. I use it very conveniently every day. 【Important】Please use it safely, taking sufficient care to ensure that the strap does not tighten around the child's neck.