When it comes to choosing between one-piece and two-piece ostomy bags, it really boils down to personal preference and practical needs. Here's a friendly breakdown of what fellow ostomates have shared about their experiences with each type:

- Two-piece systems are often appreciated for several reasons:
1. You can change the pouch orientation from vertical to horizontal without removing the skin barrier, which can be quite handy.
2. They make it easier to release gas and prevent pancaking, as the extra flange thickness keeps the pouch away from the stoma, allowing output to drop more easily.
3. If the pouch gets punctured or overfilled, you can quickly replace it without disturbing the barrier, which is great for those with constant output.
4. They work well with belts, offering added security, especially with convex systems.
5. Accordion flanges on some two-piece systems help new post-op patients attach a pouch without pressing on a tender abdomen.
6. Closed pouches and adhesive-coupling options in two-piece systems can reduce bulk compared to mechanical couplings.

- One-piece systems have their own set of advantages:
1. They are thinner and less visible under clothing, which many find appealing.
2. With fewer parts, they are quicker to apply and often more affordable in many areas.
3. Some users report fewer flange leaks compared to two-piece systems.

- When it comes to durability and wear time:
1. Some ileostomates find that two-piece systems last longer, with one-piece systems sometimes needing replacement after just 1.5 days.
2. However, others have successfully used one-piece systems for decades without any issues.

- For those concerned about leaks:
1. Leaks in two-piece systems often happen when the pouch isn’t fully clicked into place, so it's important to check the seal.
2. Mixing brands, like using a Hollister barrier ring with a Convatec or Hollister two-piece, is generally safe and not usually the cause of leaks.
3. To prevent night-time leaks, some suggest experimenting with sleep positions, such as side-sleeping or elevating the head of the bed.

- Various brands and systems are mentioned by users:
1. Hollister two-piece convex drainable systems with Velcro closures.
2. Hollister one-piece and two-piece drainable pouches, along with their belt clips.
3. Hollister barrier rings and Coloplast belts, which some attach to Hollister flanges for comfort.
4. Convatec two-piece drainable pouches with Velcro closures.
5. SenSura Mio Flip, a two-piece system.
6. General references to adhesive-coupling two-piece pouches and accordion flanges.

Ultimately, the choice between one-piece and two-piece systems depends on factors like stoma type, output consistency, skin sensitivity, activity level, and personal comfort. Many users find it helpful to try different brands and styles to see what suits them best.