There are, but they don't have constraints of being small, mobile and staying on the floor. Here is one remotely similar stuff, but it's too bulky and more com

There are, but they don't have constraints of being small, mobile and staying on the floor. Here is one remotely similar stuff, but it's too bulky and more complex (I need static ring basically and gadget that can fit the backpack) https://www.youtube.com/watch?v=xXl3F5AoeQU https://www.youtube.com/watch?v=xXl3F5AoeQU