“Customers began seeking out ways to protect their Covid-19 vaccine record cards, knowing they will likely be important to have on hand in the future,” Craig Grayson, vice president of print and marketing services for Staples, said in an email on Wednesday. “Leveraging our existing capabilities in store felt like a natural way to provide a free solution.”

People can also get their completed vaccine cards laminated for free at Office Depot and OfficeMax stores nationwide using the code 52516714 through July 25.

Dr. Ikediobi also recommends keeping the card in a safe place, as you would your passport, rather than carrying it around. “It does not necessarily need to be on your person at all times,” she said.

In some cases, yes. Border entry requirements are set by governments, not by airlines or by the International Air Transport Association, the trade association for the world’s airlines. Some destinations and cruise lines have started requiring that travelers be fully vaccinated before they travel. As of March 26, fully vaccinated Americans who can present proof of vaccination can visit Iceland, for example, and avoid border measures such as testing and quarantining, the country’s government said.

The cruise line Royal Caribbean is requiring passengers and crew members 18 or older to be vaccinated in order to board its ships, as are Virgin Voyages, Crystal Cruises and others. These companies will restart cruise operations this spring and summer. None of the companies are yet operating cruises out of United States ports, because the C.D.C. has yet to give them the guidelines they’ll need to follow.

For the moment, airlines are not requiring vaccinations for travel. But the idea has been much talked about in the industry. In an interview with NBC Nightly News recently, Ed Bastian, the chief executive officer of Delta Air Lines, said that proof of vaccination will likely eventually be required on international flights, but whether that is paper proof or a digital vaccine passport, is unclear.

Perry Flint, a spokesman for the I.A.T.A., said that the agency does not support a mandatory vaccine requirement for air travel because it “risks discriminating against those markets where vaccines may take longer to become widely available” or against those “who are not able to get vaccinated for medical reasons, or who are unwilling to do so owing to ethical or other concerns.”