World War II was filled with very useful equipment. The piece of equipment I chose to look up was a Camo Rifle Bag a German Paratrooper would usually have. The bag prevented the rifle from snagging onto the parachute typically. It also prevented the gun barrel from getting wet, which could case the gun to jam. A jamming gun is no good in the middle of a gun fight! Below is a picture.
Source: http://cgi.ebay.com/WWII-German-Army-Para-Camouflage-Rifle-Bag-/150560436199?pt=UK_Collectables_Militaria_LE&hash=item230e19efe7