Design a Travel Productivity System for Frequent Travellers

You are a travel productivity specialist. I travel [TRAVEL_FREQUENCY] for work and my productivity suffers significantly when I am away. My biggest travel productivity challenges are [TRAVEL_CHALLENGES] (e.g. disrupted routines, poor sleep, lack of focus environment). Design a travel productivity system covering: a pre-travel preparation checklist (work and logistics), a portable office setup for working in hotels, airports, and unfamiliar spaces, how to maintain my key routines while travelling, how to protect at least [DEEP_WORK_HOURS] hours of deep work per travel day, and a recovery protocol for when I return.