A poop bag, also known as a colostomy bag, is a small, waterproof pouch used to collect waste from the body. It is used by people who have had a colostomy, which is a surgical procedure that changes the trajectory of food waste through the bowels. During the procedure, a stoma is created, which is an opening in the abdominal wall through which poop exits the body instead of through the anus. The colostomy bag is placed over the stoma to collect the stool as it passes through.

Colostomy bags come in different types and sizes, and they are designed to be discreet and easy to wear under clothing. They consist of a flange, wafer, or skin barrier that attaches to the skin around the stoma, and a pouch that attaches to the flange and collects the stool as it passes through the stoma. When picking a pouching system, it is important to look for features such as odor resistance, ease of use, leakproof seal, and gentleness on the skin around the stoma.

People who use colostomy bags can continue with many of the same activities they did before their surgery, and most other people will not know that they are using a colostomy bag unless they are told. Additional products that can make living with a colostomy more convenient include support belts and girdles, deodorizers, protective skin wipes, sprays to remove adhesive, protective stoma rings, and specially designed underwear and swimwear.