When sending your Pi away on outdoor missions, the two main concerns that need to be addressed are the supply of power and protection against moisture. A lithium polymer battery pack is a good choice for powering the Pi off-road. They are usually marketed as portable smartphone chargers, but as long as yours operates at 5V and provides one or more USB ports with around 1000mA of output, it should keep your Pi happy and running, usually for five to ten hours. If you need a USB hub for your peripherals, make sure it can be powered by one of the USB ports on the battery pack.

When it comes to housing your spy kit, there are no rules except one—moisture will spoil your fun. A plastic food container with a tight lid is a good start for housing. It'll have to be transparent plastic if you plan to include a webcam with the kit obviously. You might also want to line the insides with something soft, such as bubble wrap, to make the ride less bumpy for the components. The Pi board itself will be the most fragile and should not be put in the container unprotected. Your Raspberry Pi dealer will usually carry several enclosures for the Pi, but even the simple box in which your Pi was shipped in will do.

If avoiding detection is a concern, try to think of a container that would blend into the surroundings in which you plan to put your kit. For example, an empty pizza box on top of a garbage bin wouldn't raise many eyebrows—just put the components inside a re-sealable bag in the pizza box to protect it. In fact, if you make your kit look like trash, people are less likely to want to pick it up and take a closer look. Simply putting your container inside an old plastic bag will lend it a little trashy camouflage.

Finally, always think about any negative impact your kit could have on the environment. An abandoned battery pack left outside in the sun could potentially lead to a fire or explosion. Keep a watchful eye on your kit from a distance at all times and remember to bring it back inside after a mission.