Managing excessive gas with a two-piece colostomy bag can be a bit challenging, but there are several strategies that might help make things more comfortable. If you're dealing with this issue, here are some tips and insights that could be useful:

1. Consider discussing with your doctor the possibility of small intestinal bacterial overgrowth (SIBO), as it can be a common cause of excessive gas. They can evaluate and treat it if necessary.

2. Over-the-counter chewable gas-control tablets, like simethicone, are available at places like Wal-Mart. They are affordable and have been helpful for others in managing gas.

3. Adjusting your diet might also help. Try reducing or eliminating breads and grains, as they can significantly contribute to gas production.

4. If it's suitable for you, colostomy irrigation might be an option to explore. It can help in reducing gas buildup.

5. You might want to try a different pouch with a more reliable filter. Some people have found that the Coloplast SenSura Mio two-piece system has a filter that lasts longer and reduces the need to "burp" the pouch.

6. Be careful with lubricating liquids designed to prevent pancaking, as some can cause the pouch to fill with gas. This is something to keep in mind, especially if you're using the Coloplast SenSura Mio system.

These suggestions might help you manage the situation better and make your day-to-day life a bit easier.