Whether you have a bundle of joy on the way or are knee-deep in the land of diapers and wipes, any parent can smell a poopy diaper a mile away. Likely, your little one will tip you off about what's hiding underneath their PJs — they'll typically squirm and wail to get you to notice — but if you don't have a good pail in the nursery, you're just going to end up smelling the diaper in the room after it's removed, and this smell only becomes more offensive when you close the door and open it up later.
Do yourself a favor and toss whatever trash system you have now and get the Ubbi pail ($70, originally $80). Yes, it's pricier than most pails, but you already know what most pails get you: funk floating through the air.
The Ubbi is made of steel, which traps moisture and smells, and what's even better is that you don't have to buy special bags for it. Any trash bag works. I use our regular kitchen trash bags in there and they work just fine. It's also a sleek and thin system, so I can nestle it neatly next to the changing table and it doesn't jut out in an obtrusive way. If you're thinking about your registry essentials, I highly recommend adding this.