Babies are delightful; dealing with their diapers--not so much. But since diapers must be changed many times a day, the right diaper pail can make the job less irksome and keep odors contained.
The type of diaper pail you choose may depend on whether you're using cloth diapers or disposable ones, although some pails can be used for both. Most parents who use cloth diapers often choose a "dry" system, usually a lined plastic pail where they keep soiled but rinsed diapers until laundry time. But some prefer a "wet" system, using a pail to soak diapers in water, baking soda, and white vinegar before they're laundered. You can use any sturdy diaper pail with a lid that locks for this use.
Some pails for disposable diapers are used with regular plastic garbage bags, like the kind you'd use for kitchen trash, while others require special plastic liners with other devices like air filters that are meant to minimize unpleasant odors. Dry systems for cloth diapers usually have a waterproof or water-resistant liner, often made of coated nylon. It can be put in the wash along with the diapers when they're laundered.
It's a good idea to sprinkle baking soda at the bottom of pails for cloth diapers to absorb odors, or use a deodorizer that attaches under the lid. Even with special liners or odor-reducing features, be sure to dispose of cloth diaper waste before you put it in the pail. It's also a good idea to dump the waste from disposable diapers to minimize unpleasant smells.
Think about how large a pail you want. A larger one will cut down on how often you have to empty it, but the odor might prompt you to empty the pail before it's full anyway. A taller pail requires less bending and might spare your back.
You'll also want to be sure that any model you select has a secure, childproof lid, in part because plastic liners are a suffocation risk to small children. The water in a soaking pail poses a drowning hazard as well. A curious child who climbs into a diaper pail might not be able to get out.