A pocket bong is a compact and portable smoking device designed for the consumption of dry herbs or tobacco. It's typically made of materials like glass, silicone, or acrylic and is designed to be small enough to fit in your pocket for easy transport. A typical pocket bong consists of a water chamber, a bowl for placing the herbs, a downstem to filter and diffuse the smoke through the water, and a mouthpiece for inhaling.

Here's a brief overview of how it works:

1. Fill the water chamber: Add a small amount of water to the water chamber, usually just enough to cover the bottom of the downstem.

2. Pack the bowl: Place your ground herbs or tobacco into the bowl, which is typically located at the top of the bong.

3. Ignite and inhale: Use a lighter or a torch to ignite the herbs while inhaling through the mouthpiece. The smoke travels down the downstem, through the water, and into your lungs.

4. Remove the bowl: Once the chamber is filled with smoke or you've taken a sufficient hit, remove the bowl to clear the chamber and inhale the remaining smoke.

Pocket bongs are popular among smokers who want a more portable and discreet option compared to larger bongs. However, they still provide the benefit of water filtration for a smoother smoking experience.