The best things come in pairs, like these fun (and functional) wedding gift ideas for couples. From matching robes to complimentary pillowcases, there are so many ways to celebrate your freshly minted newlywed status. We rounded up the 18 best wedding gifts for couples to register for. Everything on this list can be added to your Amazon wedding registry with a single tap. Check out our top picks now and make sure to add your favorites to your registry!