The OpenSim journal

Travel guides

Page 10

Practical travel planning and mobile connectivity advice.

More travel guides

Power bank, phone and carry-on bag beside an airport gate window

Can you take a power bank on a plane? Rules and Wh calculator

Check 2026 power bank flight rules, convert mAh to Wh, and learn the carry-on, checked bag, onboard use, China CCC and gate-check requirements.

30 Jul 2026

Travelers walking past airport check-in desks and empty queue lanes

Travel guides

EU Entry/Exit System 2026: fingerprints, queues and travel tips

Plan for the EU Entry/Exit System in 2026 with current rules for fingerprints, children, airport queues, connections, Eurostar, transit and the EES app.

29 Jul 2026