RE: Rain. If you don't buy a huge camera system then buy a box of the largest zip lock bags you can find. Cut a hole in the middle just big enough, or slightly smaller than the lens.you can then put the camera inside, and have the opening you cut tightly slide over the end of the lens. Assuming you have a lens hood you should be able to get the hood to help hold the bag in place, and protect the edge of the lens. The large bag allows you to get your hands inside to operate the camera.
I have used this method for trips and it's worked well. The bags are also pretty weightless and tape up no room. Key for those of us who just travel carry on.
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