For long-term storage, keep the gear clean, capped, dry, and at stable room temperature. Remove all batteries before storing. Humidity is the biggest risk, so avoid damp areas and use a sealed box or case with desiccant if your environment is humid.

To preserve working condition, don’t just seal everything away forever: periodically exercise the camera and lenses. About once a month is a common suggestion—fire the shutter a few times and move mechanical parts such as aperture controls and focus/zoom rings.

Use body caps and lens caps (or rear caps/clear protective filters as preferred), and store the gear where it won’t be bumped and won’t face temperature extremes. A moisture-resistant hard case or sealed plastic container can help, especially with desiccant packs inside.

The key points are: remove batteries, control humidity, avoid heat and extreme temperatures, protect from dust and knocks, and occasionally operate the mechanisms so lubricants and moving parts don’t sit idle for years.