How to contain trash/waste food smells?
I put potentially malodorous food scraps in the trash if I know I will have enough to take the trash out that day (I hate wasting trash bags, blame my OCD). If not, I will put scraps in freezer bags and leave them in the fridge temporarily. The difference between freezer bags and regular plastic bags is they are much thicker and tougher. If you get a good quality bag the zipper part seals air-tight and the plastic will not breathe. The key here is don't be cheap: You get what you pay for.

Freezer bags easily hold in odors for several days until you have enough for a load of trash to take out to the dumpster.