What is a stoma bag? Ostomy pouch types, fitting and UK guide

What is an ostomy pouch is one of the most common questions asked after stoma surgery. An ostomy pouch, also known as a stoma bag, is a medical device that collects waste through a surgically created opening in the abdomen called a stoma. These systems allow people who have undergone bowel or bladder diversion surgeries to live hygienically and confidently.

What a stoma bag is for

Stoma BeltHernia support & leak prevention. Trusted by 50,000+ ostomates worldwide.Discover →

The purpose of an ostomy pouch is to act as a safe and odour-proof waste collection system. It replaces the body’s natural waste route following procedures like a colostomy, ileostomy, or urostomy. Learning what an ostomy pouch does helps patients feel secure and better prepared for daily life.

How does a stoma bag work?

The pouch connects to the skin using an adhesive baseplate, also called a wafer. This creates a protective seal around the stoma, while the bag collects stool or urine. Some models include odour filters and vents, offering additional comfort and discretion.

Types of stoma bags: one-piece and two-piece

There are two main types of systems used in ostomy care. A one-piece pouch combines the bag and adhesive barrier for simplicity, while a two-piece system allows the pouch to detach from the wafer for quick changes. Both are lightweight and secure, helping users adapt to an active lifestyle.

Drainable and closed stoma bags

Drainable pouches can be emptied and reused for several days, while closed-end models are disposable and best for predictable output. This versatility shows how advanced ostomy technology has become over time.

What stoma bags are made of

Ostomy pouches are made from medical-grade, hypoallergenic film materials that are odour-proof and skin-friendly. The adhesives are waterproof and gentle, minimising irritation. Leading brands such as Hollister, Coloplast and Convatec make both one-piece and two-piece systems.

SIIL Ostomy offers advanced accessories that improve how pouches fit and feel. Their breathable belts and wraps, made with organic spandex, help prevent moisture buildup and skin irritation.

How to fit a stoma bag correctly

1. Clean the stoma area with warm water and mild soap.
2. Ensure skin is completely dry before applying the barrier.
3. Cut the wafer opening to fit the stoma size exactly.
4. Attach the pouch securely and press gently for adhesion.
5. For added comfort, use a SIIL Wrap.

Tips to improve stoma bag adhesion

Always warm the adhesive before application, avoid oily skin products, and use SIIL’s breathable belt for superior support.

Why skin protection matters

The area around the stoma (peristomal skin) is highly sensitive. Poorly fitted pouches or frequent leaks can lead to irritation or infection. Using breathable covers and support garments from SIIL Ostomy helps maintain healthy, dry skin and secure fit throughout the day.

Stoma bags on NHS prescription in the UK

In the UK, stoma bags are supplied on NHS prescription. The NHS explains that if you have a permanent ileostomy, your GP will give you a prescription so you can order stoma bags free of charge; if you have a temporary ileostomy you may need to pay for them. In England most working-age adults pay a charge for each prescribed item, but a permanent colostomy or ileostomy that needs an appliance entitles you to a 10-year medical exemption certificate, which makes your NHS prescriptions free. NHS prescriptions in Scotland and Wales are free for everyone. You can choose where you get your bags from and which type suits you, and your stoma nurse can explain how to order them. Sources: NHS – recovering after an ileostomy and NHSBSA – help with NHS prescription costs.

FAQs about stoma bags

Why understanding your stoma bag matters

Understanding what is an ostomy pouch gives patients confidence to manage daily care with ease. With the right knowledge and high-quality products from SIIL Ostomy, individuals can enjoy comfort, skin safety, and peace of mind every day.