We have used collapsible soft tote boxes from IKEA for years. They compress if necessary, fold down to nothing when not needed, and are very reasonable. Might be worth a try!
We did this last week. The test has to be done the day before you cross the border, so we did it in Oregon at a shopping mall. Cost was $129 US each, and results were emailed to us within half an hour.Easy peasy. FYI, the border patrol person did not...
