This Joovy "mattress" sheet fits perfectly. I've read other reviews that it doesn't fit, but you have to tuck the sheet in, then lift the mattress and put it back on. If you move a little it will come up with no problem. We had to use the Joovy as a 'cradle' for our two year old on holiday who doesn't fit in a normal sized backpack and no longer plays but can't stand the freedom of a regular bed or sleeping bag. It turned out perfect, no complaints.
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