If you have any plastic large envelopes or bags like you might get from another online retailer you can use that. You might need 2 and tape them together.
Another idea is a large heavy duty plastic bag from a retail store. Like a sturdy one that doesnt rip easy. Use 2 if needed and double bag. Secure corners well. Cut to size needed.
Same with a box. If you dont have a thin longer box then score one down to size that is long or take 2 thin but small boxes and tape together to fit.
To score down a too tall box use a pair of scissors or knife. Do not cut. Run it along the inside where you need it to fold over. Make that line and bam it folds right over.
