After reading all the reviews here and on other sites, I tried one of my own pillowcases (100% cotton, much more desirable than the poly/cotton blend Graco used with their cover) and it fit perfectly. There was only about an inch or so on the end to tuck under at the foot and the sides were perfectly snug. A very tight, good fit that doesn't buckle the mattress as I read on some other reviews of this product. No need to waste your time/money on this questionable product!