In following the original poster's question about an alternative to the steam bags some veggies come in, I think the Ziplock or Glad steamable bags might be the only alternative, other than just steaming on the stovetop. These bags are much thicker than normal bags and I've been cleaning and reusing them numerous times, which would bring the inital cost down substantially.
For freezing foods in general, the FoodSaver vacuum system can't be beat and those bags can be microwaved or boiled in water, which opens more doors for potential meal-in-a-bag options. I, for example, will cook up batches of brown rice that take a long time to make, putting single-serve portions in a FoodSaver bag and freeze. Then I only have to reheat in a microwave or boiling water later.
I do not know if the Reynolds handi-bag bags are microwave or boiling water safe.
Support bacteria. It's the only culture some people have.