When washing my top mattress covers, or even if only taking them off and putting them back on, I always have trouble putting them back on without the (foam) mattress buckling inside, making bumps that are uncomfortable to sleep on. It seems like the mattress is slightly too big for the cover, so it should be slightly compressed inside the cover, but putting it on makes the compression uneven or it bends instead of compressing.
Are there any tricks to put these covers on while keeping the mattress smooth?