The case weighs just 6 ounces empty and measures 7 1/8 inches long x 2 1/4 inches in diameter. It is divided into 2 compartments. The lower compartment holds batteries and other small gear. The upper compartment holds an LED flashlight and closes with a transparent top that (1) allows the flashlight beam to shine through, (2) allows the flashlight to be turned on or off without opening the case, and (3) serves to prop the flashlight up for handsfree use when the case is open. Both the bottom compartment and the case top are attached to the case body with elastic so they can't be lost. The case can also be hung from any hook with flashlight inside to act as a small area light.
Step 1: Choose your flashlight.
If you would like to be able to turn your flashlight on and off without removing the case's top, you should choose a flashlight with a push-button tailcap switch. The switch should not be recessed within the flashlight's tailcap.
The flashlight I used for this project is a generic Chinese-made model that I purchased in a 2-pack from Harbor Freight Tools for $3.99.