This topic is all about comparing one-piece and two-piece ostomy appliances, focusing on the real-world pros and cons of each. An ileostomate is seeking advice on these systems, particularly looking for opaque options, and has already tried some samples. Here are some insights and advice shared by others:

1. **Visibility & Ease of Alignment**
- Two-piece systems allow you to see the stoma while attaching, which many find helpful.
- One-piece users appreciate clear pouches for easy centering and monitoring of output.

2. **Bulk, Profile & Comfort**
- One-piece systems are generally thinner and lie flatter under clothing.
- Two-piece systems can be bulkier but offer the flexibility to rotate the pouch for added comfort during activities like sleeping or sports.

3. **Sample, Mix & Match**
- It's a good idea to order free samples from various manufacturers like Hollister, Coloplast, ConvaTec, Salts, B. Braun, and Dansac. Nurses often have extras.
- You can mix and match brands, such as using a Coloplast flange with Hollister rings.

4. **Product & Part-Number Recommendations**
- Hollister offers options like the concave pre-cut base plate and opaque drainable pouches.
- Salts Healthcare provides silky drainable or closed pouches in various colors.
- Coloplast has the Sensura Mio Click and other accessories like Brava seals.
- ConvaTec and B. Braun also have recommended products, with some users appreciating moldable wafers.

5. **Support Rings, Washers & Seals**
- Products like Salts RC washers and Eakin rings help guide output and prevent leaks.
- These are especially useful with convex bases or for those with hernias.

6. **Leak Prevention & Wear Time Tips**
- Choosing the right base (convex or concave) can help with stoma projection or nesting.
- Belts and elastic strips add security, with some achieving 5–12 days of wear with two-piece systems, while one-piece users often change more frequently.

7. **Drainable vs. Closed Pouches**
- Drainable pouches are convenient for rinsing, while closed pouches are preferred by some for easy disposal despite the higher cost.

8. **Aesthetics & Discretion**
- Opaque or colored bags are favored for their non-medical appearance, while clear bags are generally disliked for everyday use.

9. **Special Features Called Out**
- Hollister’s bags with Lock-n-Roll closure and viewing windows are noted.
- Coloplast’s Convex Flip design and flexible flanges are appreciated for comfort and skin healing properties.

10. **General Guidance**
- Your activity level can influence your choice, with many active users preferring two-piece systems for their flexibility.
- Keep experimenting, as your needs may change with lifestyle, skin condition, or travel.