As much as I love to travel, my 76-year-old grandparents are the most frequent fliers in my family. Their most recent trips include Italy, Portugal, Hawaii, Alaska, California, and Florida, with even more river cruises around Europe and a safari in Africa on the docket.  That being said, they have become packing experts, and their go-to spot for all their travel essentials is Amazon. From the compression socks my grandmother never travels without to the wrinkle-free jeans my grandfather swears by, they shared all their travel must-haves with me. Keep reading for their tried-and-true travel essentials, starting at just $8. Best Travel Essentials for Seniors Grandma's no. 1 pick: iHealth Neo Wireless Blood Pressure Monitor , $50 (originally $80) Grandpa's no.…