Question: how to put a memory foam mattress topper back in the box?
Answer: Allow the topper to dry completely from water or sweat before storing it away to prevent damage or unpleasant odors. ... 
Fold the topper into thirds. ... 
Roll up the topper. ... 
Place the topper in the bag without attempting to close it. ... 
Close the zipper on the bag about halfway, as far as you can go.