Using a colostomy bag involves three core skills: applying the pouching system to your body, emptying it before it gets too full, and caring for the skin around your stoma. Most people get comfortable with the routine within a few weeks, though the learning curve can feel steep at first. Here’s what the process actually looks like day to day.
One-Piece vs. Two-Piece Systems
Colostomy bags come in two basic designs, and how you apply them differs depending on which you use.
A one-piece system combines the adhesive skin barrier and the collection pouch into a single unit. You peel off the backing, position it around your stoma, and press it onto your skin. It’s straightforward, but when you need to change the pouch, you’re replacing the entire thing, adhesive and all.
A two-piece system separates the adhesive barrier from the pouch. You stick the barrier (sometimes called a wafer) to your skin, and the pouch snaps or clicks onto the barrier through a flange connection. The advantage is that you can swap out the pouch without disturbing the adhesive seal, which means less skin irritation over time. The barrier itself typically stays in place for several days before needing replacement.
Neither design is objectively better. One-piece systems sit flatter against the body and feel less bulky under clothing. Two-piece systems give you more flexibility to change or air out the pouch. Your ostomy nurse will help you choose, but many people try both before settling on a preference.
How to Apply the Pouching System
Before you start, gather everything: your pouch or barrier, scissors (if you need to cut the opening), a measuring guide, warm water, a soft cloth, and any accessories you use. A clean, flat surface like a bathroom counter works well.
First, remove the old system. Never rip or tear the adhesive off. Start with one corner and slowly peel back, pressing down on your skin as you lift the barrier away. Adhesive remover wipes or spray can make this easier and reduce irritation. Clean the skin around your stoma with warm water and a soft cloth. Avoid oil-based or moisturizing soaps, because soap residue leaves a film that prevents the new adhesive from sticking properly. Let the skin dry completely before applying anything new. Damp skin leads to a weak seal and increases the risk of fungal growth.
Your stoma changes size for up to 10 weeks after surgery, so measure it each time you change the barrier during that period. Use the measuring guide that came with your supplies, then cut the barrier opening to match. The goal is a snug fit around the stoma with no more than an eighth of an inch of exposed skin. Too large an opening lets output contact your skin. Too tight risks constricting the stoma.
Warm the adhesive barrier between your hands for a minute or so before applying it. This makes it more pliable and improves the seal. Press it firmly around the stoma, starting closest to the stoma and working outward. Hold gentle pressure for about 30 seconds. If you’re using a two-piece system, click the pouch onto the flange and give it a light tug to confirm it’s secure.
When and How to Empty the Pouch
Empty a drainable pouch when it’s about one-third full. Don’t let it reach half full. A heavy pouch pulls on the adhesive seal, which leads to leaks. Most people empty several times a day depending on their output.
To empty, sit on the toilet and point the pouch tail between your legs into the bowl. Unclip or unroll the closure at the bottom and let the contents drain. You can gently squeeze the pouch from top to bottom to push everything out. Once it’s empty, wipe the inside and outside of the tail opening with toilet paper. This small step makes a real difference in controlling odor. Re-seal the closure and you’re done. The whole process takes a couple of minutes.
Managing Gas and Odor
Gas is normal and will collect in the pouch, causing it to balloon. Many pouching systems include built-in charcoal filters that slowly vent gas while neutralizing the smell. These filters work reasonably well for moderate gas, but they can clog if output is liquid or if you use lubricant-deodorant drops inside the pouch. If your gas output is high, a separate venting accessory may work better than relying on the built-in filter alone.
Certain foods are well-known gas producers for people with colostomies: broccoli, cabbage, cauliflower, Brussels sprouts, dried beans, onions, garlic, corn, eggs, and carbonated drinks. Beer tends to be particularly problematic. Beyond food, swallowing extra air also increases gas. Chewing gum, drinking through a straw, eating too fast, and skipping meals (which causes you to gulp food at the next one) all contribute.
Pouch deodorant drops or tablets placed inside the bag can help with smell. A few drops of lubricating deodorant also coat the inside of the pouch, making it easier for output to slide to the bottom rather than clinging to the walls.
Protecting the Skin Around Your Stoma
The skin surrounding your stoma (called peristomal skin) should look like the skin on the rest of your abdomen. Redness, sores, or a burning sensation are signs something is off, usually a poorly fitting barrier or exposure to output.
A few key practices keep peristomal skin healthy. Stick to a regular changing schedule so the adhesive barrier is replaced before it starts to erode. Use barrier wipes, sprays, or films as a protective layer between your skin and the adhesive. In hot or humid weather, a pouch with a fabric backing prevents the plastic from trapping moisture against your skin.
Skin barriers infused with ceramides, a type of fat naturally found in skin, have shown significant benefits. A recent meta-analysis found that ceramide-infused barriers increased the odds of preventing skin complications by 77% compared to standard barriers. They also improved quality of life scores. If you’re experiencing ongoing skin irritation, asking your supplier about ceramide-based options is worth considering.
Preventing and Troubleshooting Leaks
Leaks are the most common frustration, and they almost always trace back to the seal between the barrier and your skin. Uneven skin surfaces, creases, folds, or a stoma that sits flush with or below the skin surface can all prevent a flat seal.
Barrier rings are soft, moldable rings that fill gaps between the barrier and your skin. You can cut, stretch, or stack them to customize the fit. For stomas that are recessed or sit in a skin fold, convex barrier rings or convex wafers press gently inward to push the stoma outward, giving output a clearer path into the pouch instead of pooling under the seal. Barrier paste serves a similar gap-filling purpose, though rings are generally easier to work with.
If your pouch is leaking repeatedly, re-measure your stoma. Weight changes, posture, and healing can all alter the shape and size over time. A difference of even a few millimeters in the barrier opening can mean the difference between a secure seal and a daily leak.
What a Healthy Stoma Looks Like
A healthy stoma is beefy red or pink, moist, and shiny. It looks similar to the inside of your cheek. Some minor bleeding when you clean around it is normal because the tissue has a rich blood supply. The stoma has no nerve endings, so you won’t feel pain on the stoma itself.
Check your stoma every time you change the barrier. Contact your doctor if the skin around the stoma becomes red, raw, or develops sores or pus-like discharge. Also reach out if the stoma changes size by more than half an inch in a single day, appears dry rather than moist, seems to be pulling inward (retracting) or pushing outward excessively, or if post-surgical swelling increases rather than decreasing over the weeks following your operation.
Certain color changes are emergencies. A stoma turning very pale means poor blood supply. A purple or black stoma means tissue is dying and requires immediate medical attention. Whether your surgery was recent or years ago, extreme color changes warrant a call to your surgeon or a trip to the emergency room.
Building a Daily Routine
Most people settle into a rhythm that involves emptying the pouch several times a day and changing the entire barrier system every three to five days, though this varies. Some find it helpful to change the barrier first thing in the morning before eating, when output tends to be lowest.
Keep a small kit with spare supplies in your bag or car: an extra pouch, barrier wipes, a plastic bag for disposal, and a change of clothes. Knowing you’re prepared for an unexpected leak takes a surprising amount of anxiety out of leaving the house. At home, set up a dedicated spot with all your supplies organized and within reach. The more streamlined your routine, the faster and less stressful each change becomes.