I handmade a shoulder strap for a Thermos vacuum insulated baby straw mug (model number FJL-350). I am selling them in blue, pink, yellow, brown, ivory, beige, and gray. Please take a look at my profile (they 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 when you go out. A shoulder strap for a straw mug is very convenient for carrying it around. The official Thermos cover cannot be used as a shoulder strap, but this product can be used as a shoulder strap by both children and adults by adjusting the length of the strap. It is 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 strap only for the upper part, not a full cover. My grandchild requested that they be able to carry it from the nursery school, and after much trial and error, I completed it. I use it very conveniently every day. 【Request】Please use it safely, taking sufficient care to ensure that the strap does not close around the child's neck.