A well designed trail camera is both light weighted and versatile. Luckily all modern trail cameras are more or less light weight and quite small too, so that you can easily carry them in and out of your scouting location. Modern cameras are also versatile in a way that allows them to be mounted in trees, rain gutters, poles etc. without trouble.
Trail camera cases are usually made of durable plastic. There are some differences in the designs between different manufacturers and some models can have quite flimsy execution. In general however the cases tend to be sturdy and weatherproof.