“Increasingly, people are being asked to turn over and unlock their phones at the border, and doing that can expose a huge amount of data. Add in an app like 1Password — a central repository for a ton of private data — and it’s easy to see why someone would be worried about having to hand over their phone.”
Read more: https://www.theverge.com/2017/5/23/15681990/1password-travel-mode-feature-added-security