Value Gear is a manufacturer of quality resin storage bits for scale modelers. Value Gear's mission statement is:
...to give model builders (me included) a more useful spares box! Creating and casting sets of Generic/Universal stowage. No helmets no weapons and nothing to keep you from using it in a wooden cart, a chariot, a truck, or a panther tank. "Any Army Any Era!" is my motto. They won't work on everything but so far I have seen people use them on so many different trucks and tanks and even some War Hammer tanks and dioramas. Stowage are accents to help give your model some story or a lived in realistic look. Armies live under canvas...
With a wide selection of scales and storage options, Value Gear makes good on their mission. Because crate and canvas scale is all a matter of perspective any of their products apply well to Warhammer 40K or other tabletop wargames.
Andy's Hobby Headquarters has a great tutorial video on creating tarps and bags with Steve of Value Gear Details:
Below are my results from following the above tutorial. I do think I need a bit more practice on my tarps, Steve is a pro at this.
Below are my results from following the tutorial with similar paints I have on hand.