Some pumpkins will work better than others when it comes to making a bong out of them. Look for pumpkins that have height since it’s more important than roundness. Height is crucial for having adequate space for a mouthpiece and a downstem. When you’re at the pumpkin patch, simply look for a pumpkin that you can easily imagine turning into a bong. Don’t use pumpkins that are too large since it will be hard to puff from; handheld sizes will be more convenient.