This one says it has overload protection. I know that surge protection is not allowed. Are strips with overload protection okay? I'm guessing it will probably depend on the person inspecting your luggage.

FYI - I brought this one onboard to our trip last week. No issues:

https://www.amazon.com/gp/product/B001UE7SC8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1