With an elastic fit around the lens hood and a velcro slit for the tripod you have an 'all-in-one' cover.
The draw cord at the camera back can be loosened/tightened depending on conditions.
You can use it with your hand through the velcro opening to work the controls or you can even fire the shutter through the material or use a cable release with just a small opening to look through.
The size 3 and 4 have a velcro strap between the tripod foot and lens hood to keep cover in place.
Long lenses and cameras may cost many hundreds, if not thousands of pounds. These covers, as well as camouflaging, are invaluable towards protecting your equipment. The triple layer insulates the camera and lens and reduces battery drain.
Triple layer with heat pack pocket cover in proofed polycotton Advantage timber on one side and waterproof olive pu nylon on the other. Also available in Camouflage, Olive, Desert, White (plain white for snow). See C40.7 for heat pads.
Elastic fit around lens hood and draw cord back. Designed as a loose cover for camera and lens.
Aids camouflage and gives some protection against the weather; hot, cold or wet. See C81 for end of lens cover/cap.