What is a closed-end versus drainable stoma bag?

A closed-end pouch is sealed at the bottom and is discarded when full — it is not intended for drainage while worn. Closed pouches are most suitable for colostomy patients who have regular, predictable output. A drainable pouch has an open tail at the bottom with a clip, clamp, or velcro closure that can be opened to drain output while the pouch remains attached to the body. Drainable pouches can be emptied multiple times before being changed and are standard for ileostomy and urostomy use. When specifying for procurement: colostomy supplies typically use closed or drainable; ileostomy always drainable; urostomy always drainable with valve.

What regulatory certifications are required for stoma bags?

Stoma bags are classified as Class IIa medical devices in the European Union under EU MDR 2017/745, requiring CE certification with notified body involvement. Key applicable standards include ISO 8670-2:1996 (confirmed 2017) for ostomy collection bag requirements and test methods, and ISO 12505-1:2014 for skin barrier test methods. For the US market, FDA 510(k) clearance is required. For GCC markets, SFDA registration is mandatory. Manufacturers must also hold ISO 13485 quality management system certification. Procurement specifications should explicitly request CE Class IIa certificates, ISO 8670-2 test reports, and ISO 13485 certification.

Kingphar Medical Group

New's

7/6 2026

Wound Care & Ostomy · Specifications Guide

Stoma Bag Specifications:
Types, Sizing, One-Piece vs Two-Piece
and Procurement Guide

Q: What is the difference between a colostomy bag, ileostomy bag, and urostomy bag?

All three are types of ostomy pouching systems, but each is designed for a different type of surgical diversion. A colostomy bag collects output from a colostomy — where the large intestine (colon) is redirected to a stoma on the abdominal wall. Output is typically semi-solid to solid. An ileostomy bag collects output from an ileostomy — where the small intestine (ileum) is redirected. Output is liquid to semi-liquid and higher in volume, so ileostomy bags are almost always drainable rather than closed. A urostomy bag collects urine from a urinary diversion — where the ureters are redirected following bladder removal. Urostomy bags always have a drainage valve and often include an anti-reflux valve. When specifying for hospital procurement, always state the ostomy type: colostomy, ileostomy, or urostomy. They are not interchangeable.

Q: What is the difference between a one-piece and two-piece stoma bag system?

In a one-piece system, the skin barrier (adhesive wafer) and the collection pouch are permanently attached as a single unit. It is simpler to apply, has a lower profile under clothing, and is changed as a complete unit every 1–3 days. In a two-piece system, the skin barrier (base plate or flange) and the pouch are separate components. The barrier is applied to the skin and typically stays in place for 2–3 days; the pouch snaps onto the flange and can be changed independently multiple times per day without removing the barrier. Two-piece systems offer more flexibility and are preferred for patients who need frequent pouch changes. Hospital procurement for general ostomy supply typically stocks both formats.

Q: What does cut-to-fit mean on a stoma bag?

Cut-to-fit refers to the skin barrier opening, which comes with a small pre-cut starter hole that the user cuts to match their stoma's exact size and shape. Standard cut-to-fit ranges are 15mm to 60mm or 15mm to 65mm, accommodating virtually all adult stoma sizes. A stoma measuring guide card is typically included in the package. The alternative is a pre-cut barrier, which is factory-cut to a fixed standard size. Cut-to-fit is recommended for procurement because it accommodates the natural variation in stoma sizes across patients, and because stoma size often changes in the weeks following surgery. Pre-cut is ordered when a patient has a stable, known stoma size.

A complete reference for hospital procurement teams and medical distributors sourcing ostomy pouching systems: clarifying the three ostomy types, one-piece versus two-piece systems, closed versus drainable configurations, cut-to-fit sizing, and bulk procurement specifications for hospital supply chains and GCC health authority tenders.

Colostomy · Ileostomy · Urostomy One-Piece & Two-Piece Systems Cut-to-Fit 15–60mm Hydrocolloid Skin Barrier Non-Woven / Transparent ISO 8670-2 · CE Class IIa

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Cut-to-Fit Range

15–60mm

Standard opening range

Adult Stoma Size

25–35mm

Most common diameter

Capacity (Adult)

300–800ml

Standard pouch range

Standard

ISO 8670-2

CE Class IIa · ISO 13485

Section 01 · The First Questions

Colostomy, Ileostomy, Urostomy — Three Bags or One? And One-Piece vs Two-Piece?

Hospital procurement teams sourcing ostomy supplies face the same two questions every time: are these three product types interchangeable, and which system configuration should the formulary specify? Both questions have clear answers that determine everything about what gets ordered.

Three Ostomy Types — Not Interchangeable

Colostomy, ileostomy, and urostomy bags are all ostomy pouching systems, but each is engineered for different output characteristics. Using the wrong type for a patient's ostomy type risks leakage, skin damage, and patient discomfort.

Large Intestine

Colostomy Bag

Output: semi-solid to solid
Lower output volume than ileostomy
Closed-end or drainable
Stoma location: left abdomen
Changed every 1–3 days
Most common ostomy type

Small Intestine

Ileostomy Bag

Output: liquid to semi-liquid
Higher output volume — needs draining
Always drainable — not closed
Stoma location: right abdomen
Emptied 4–6 times per day
Capacity critical — 400–800ml

Urinary Diversion

Urostomy Bag

Output: urine only
Always drainable — with tap valve
Anti-reflux valve standard feature
Night drainage bag connection option
Capacity: 350–600ml typical
Following bladder removal surgery

Procurement Specification Language

Always specify ostomy type explicitly in tender documents. "Ostomy bag" or "stoma bag" without type designation will result in suppliers offering any configuration. Required language: "Colostomy pouching system — one-piece drainable, cut-to-fit 15–60mm" or equivalent. Separate line items for colostomy, ileostomy, and urostomy are standard practice in hospital formulary management.

One-Piece vs Two-Piece System

This is the second foundational procurement decision — and it determines not just the product specification but the clinical workflow for ward nursing staff.

Simpler · Lower Profile

One-Piece System

Skin barrier permanently attached to pouch
Single application — peel and stick
Changed as complete unit every 1–3 days
Lower profile — less visible under clothing
Better for stomas with nearby bulge or hernia
Simpler for new ostomates to learn
Lower unit count per patient per day

More Flexible · Preferred by Experienced

Two-Piece System

Skin barrier (flange) and pouch are separate
Barrier stays on skin 2–3 days
Pouch snaps on/off independently
Pouch can be changed without disturbing barrier
More versatile — preferred for active patients
Higher total unit count per patient
Snap-ring or click system — audible closure

Section 02 · Pouch Configuration

Closed-End vs Drainable: Choosing the Right Pouch Configuration

Feature	Closed-End Pouch	Drainable Pouch
Bottom design	Sealed — not intended for drainage	Open tail with clip, clamp, or velcro closure
Reuse while worn	No — discarded when full	Yes — emptied multiple times
Typical use	Colostomy with regular, predictable output	Ileostomy, urostomy; high-output colostomy
Patient convenience	Simpler — no emptying required	More management steps but fewer changes
Procurement volume	Higher — 1 unit per output episode	Lower — each pouch used longer
Closure types	N/A (sealed)	Clip/clamp · Velcro · Integrated closure

Output Type Determines Configuration

Closed-end pouches are appropriate for colostomy patients with formed, predictable output — particularly those who practice colostomy irrigation. Drainable pouches are mandatory for ileostomy (liquid output, high volume) and urostomy (continuous urine flow). When in doubt during formulary planning, drainable is the more versatile choice and can serve both colostomy and ileostomy patients.

Section 03 · Sizing Guide

Cut-to-Fit vs Pre-Cut: Sizing the Skin Barrier Opening

The most clinically critical dimension in an ostomy pouching system is the skin barrier opening — the hole through which the stoma passes. An opening that is too large allows stoma output to contact peristomal skin, causing irritation and breakdown. An opening that is too small risks injuring the stoma. The standard recommended clearance is 2–3mm around the stoma circumference.

Standard Adult Stoma Dimensions

Most common adult stoma diameter — 25–35mm
Post-surgical period — stoma size changes significantly in the first 6–8 weeks as swelling resolves; cut-to-fit is essential during this period
Long-term stable stoma — size typically stabilises; pre-cut becomes an option
Stoma shape — can be round, oval, or irregular; cut-to-fit accommodates all shapes; pre-cut is round only

Feature	Cut-to-Fit	Pre-Cut
Opening range	15mm–60mm (up to 65mm)	Fixed standard sizes (e.g. 25mm, 32mm, 40mm)
Stoma shapes	Any shape — round, oval, irregular	Round only
Measuring guide	Stoma measuring card included	Not required
Best for	Post-surgical (changing stoma), irregular shapes, new patients	Stable, round stoma with known size
Procurement default	Recommended — covers all patients	Only when patient-specific size confirmed

Hospital Formulary Recommendation

For hospital wards managing post-surgical ostomy patients, specify cut-to-fit as the standard procurement format. Cut-to-fit (15–60mm range) accommodates every patient without requiring pre-sizing, reduces SKU complexity, and is essential during the post-operative period when stoma size changes weekly. Pre-cut sizes can be stocked as secondary items for long-term stable outpatients with known stoma dimensions.

Section 04 · Materials & Construction

Skin Barrier, Pouch Material, and Odour Control

Skin Barrier (Wafer / Flange)

The skin barrier is the adhesive component that attaches to the skin around the stoma. It serves two functions simultaneously: protecting the peristomal skin from stoma output, and securing the pouch in position. The barrier material determines wear time, skin compatibility, and adhesion strength under activity.

Medical hydrocolloid — the industry standard skin barrier material. Absorbs small amounts of moisture while maintaining adhesion. Skin-friendly formulation designed for sensitive peristomal skin. Wear time 1–3 days for one-piece; barrier stays 2–3 days in two-piece systems.
Barrier shape — flat barrier (standard) or convex barrier (designed for flat, retracted, or flush stomas where outward pressure improves the seal)
Moldable barriers — soft, hand-moldable hydrocolloid that adapts to irregular stoma shapes without cutting; premium option for complex stomas

Pouch Body Materials

Non-woven outer layer — double-layer soft non-woven fabric reduces friction against skin and clothing; reduces noise from pouch movement (critical for patient discretion); neutral skin-tone options available
Transparent inner film — allows visual inspection of stoma and output; preferred post-operatively for nursing observation
Opaque inner film — preferred by patients for privacy and discretion in daily life

Odour Management

Activated charcoal filter — integrated into the pouch, neutralises and releases intestinal gas while preventing odour escape
Deodorising film — inner lining treated with odour-absorbing agents
Barrier film — the multi-layer pouch construction itself creates the primary odour barrier; high-quality film is essential for discretion

Post-Operative Bowel Surgery Colorectal Cancer Crohn's Disease Ulcerative Colitis Bladder Cancer Trauma Surgery Diverticulitis Hospital Ward Stock Home Care Supply Surgical Oncology

Sourcing Stoma Bags for Hospital or Distributor Tender?

Kingphar Medical supplies one-piece and two-piece ostomy pouching systems — colostomy, ileostomy, and urostomy configurations — with hydrocolloid skin barriers, cut-to-fit 15–60mm, CE Class IIa and SFDA documentation for GCC health authority tenders.

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Section 05 · Specifications & Compliance

Complete Specification Sheet and Regulatory Framework

Parameter	Specification
System types	One-piece · Two-piece (separate barrier + pouch)
Ostomy types	Colostomy · Ileostomy · Urostomy
Pouch configuration	Closed-end · Drainable (with closure)
Cut-to-fit range	15mm – 60mm (up to 65mm)
Adult stoma diameter	25–35mm most common
Recommended clearance	2–3mm around stoma
Pouch capacity (adult)	300–800ml (drainable standard)
Pouch capacity (paediatric)	100–300ml
Skin barrier material	Medical hydrocolloid wafer
Pouch outer	Double-layer non-woven fabric (noise-reducing)
Pouch inner	Transparent or opaque barrier film
Odour control	Activated charcoal filter
Closure (drainable)	Clip / clamp · Velcro · Integrated closure
Flange diameter (two-piece)	Standard ranges: 45mm, 57mm, 70mm
Latex-free	Yes
Single use	Yes — disposable
Wear time (one-piece)	1–3 days
Wear time (two-piece barrier)	2–3 days (barrier); pouch changed independently

Applicable Standards and Certifications

Standard / Certification	Market	Scope
ISO 8670-2:1996 (2017)	Global	Ostomy collection bags — requirements and test methods
ISO 12505-1:2014	Global	Skin barrier test methods — size, surface pH, water absorbency
CE Class IIa (MDR 2017/745)	EU / EEA	Class IIa — notified body required
ISO 13485	Global	QMS — manufacturer certification
FDA 510(k)	United States	Market clearance for ostomy devices
SFDA	Saudi Arabia / GCC	Medical device registration — required for GCC market

OEM and Private Label

Ostomy type: colostomy, ileostomy, or urostomy configuration
System: one-piece or two-piece
Pouch configuration: closed-end or drainable
Cut-to-fit range or pre-cut size specification
Capacity: 300ml, 450ml, 600ml, 800ml
Pouch finish: transparent or opaque / non-woven outer
Closure type: clip, velcro, or integrated
Private-label packaging with Arabic/bilingual labelling for GCC
Minimum order: 500 units standard; 5,000 units custom OEM

FAQ · Procurement Questions Answered

What Hospital Buyers Ask

What is the difference between a colostomy bag, ileostomy bag, and urostomy bag?

All three are ostomy pouching systems, but each is designed for different output. A colostomy bag collects semi-solid to solid output from a colon stoma (left abdomen). An ileostomy bag collects liquid to semi-liquid output from a small intestine stoma (right abdomen) and is always drainable due to high output volume. A urostomy bag collects urine following bladder removal surgery and always features a drainage valve and anti-reflux valve. They are not interchangeable — always specify ostomy type explicitly in tender documents.

What is the difference between a one-piece and two-piece stoma bag system?

In a one-piece system, the skin barrier and pouch are permanently attached and changed together every 1–3 days. It is simpler to apply and has a lower profile. In a two-piece system, the skin barrier (base plate/flange) stays on the skin for 2–3 days while the pouch snaps on and off independently for each emptying or change. Two-piece offers more flexibility for patients who need frequent pouch changes. Hospital formularies typically stock both.

What is the difference between a closed-end and drainable stoma bag?

A closed-end pouch is sealed at the bottom and discarded when full — suited for colostomy patients with regular, predictable output. A drainable pouch has an open tail with a clip or closure that allows emptying while still attached. Drainable is mandatory for ileostomy and urostomy; closed-end is a colostomy-specific option. When in doubt, drainable is the more versatile procurement choice.

What does cut-to-fit mean on a stoma bag?

Cut-to-fit means the skin barrier has a small starter hole that the user cuts to match their stoma's exact size (15–60mm range). A stoma measuring guide card is included. This is recommended for hospital procurement because it accommodates all stoma sizes and shapes, and because stoma size changes frequently in the weeks following surgery. Pre-cut (factory-cut to a fixed size) is only appropriate for stable, round stomas with confirmed dimensions.

What certifications are required for stoma bags?

Stoma bags are Class IIa medical devices in the EU, requiring CE certification with notified body involvement. Key standards are ISO 8670-2 (ostomy bag requirements and test methods) and ISO 12505-1 (skin barrier test methods). ISO 13485 QMS is required from any credible manufacturer. FDA 510(k) for US market; SFDA registration for GCC markets. Procurement specifications should explicitly request CE Class IIa certificates and ISO 8670-2 test reports.

Build Your Ostomy Pouching System Specification

Kingphar Medical supplies colostomy, ileostomy, and urostomy pouching systems — one-piece and two-piece — with hydrocolloid barriers, cut-to-fit 15–60mm, CE Class IIa, ISO 8670-2 test reports, and SFDA registration for GCC health authority tenders.