Items I used:
1x 2 1/2 gallon Jumbo Ziplock Bag
8x 6" inch strips of duct tape
1x pair of scissor
1x hood lens
1x black pen
I went with a plastic 2 1/2 gallon jumbo ziplock bag because I found this bag is stronger than a regular shopping bag. Less prone to tear and can be used repeatedly and also folds compact for a pant or camera bag pocket.
Step 1.
Take your roll of duct tape and affix strips to the middle of the plastic bag. The duct tape will strengthen the cut out, preventing it from tearing.
Step 2.
Grab the lens hood of the widest (radius) lens you plan on using. Using a marker out line the inner circle of the lens hood. It will be slightly smaller then lens itself, but this makes it fit snugly around your lens without having to use a rubber band.
This project is pretty cheap, you might already have everything at home. If the you varying width sizes of lenses such as a 77mm and a 62mm you can make 2 or more of these rain covers. They fold up nicely and you can use the marker to identify which one is which.
Step 3
Open up the bag and insert the scissor into the bag. Start cutting out the circle shape you outlined with the marker. Only cut the hole out of one side of the bag.
Step 4
Place your camera inside the plastic bag, keeping the bag opening facing down. Slide the lens through the opening and you are set. The 2 1/2 Gallon Bag is be big enough for Full Frame and Crop Sized DSLR cameras. The larger bag size still allows you to access your camera dials, setting buttons, and shutter button. Access to the QR plate is still easy.
If you have a smaller entry level camera or a point and shoot camera you use the same ideas just on a smaller 1 gallon plastic bag.