Exit bag tutorial or alternative

[grievingcarcass]

ive tried finding videos on how to construct them but i havent had any luck. they are either to complicated or not very in depth. does anyone know where i can find one or where i can just purchase one? on the other hand ive looked for alternatives such as eebd hoods but i have no idea if they work or not. please let me know if you have any ideas thank you :)