不能帶液體上機?

Depending where you are flying to... As there are currently 2 different regulation depending on the country you are traveling to...
For all flights to USA, you are only allow to bring 3oz of liquid onboard of each type of liquid you need... You will be checked on liquid when you pass through the second security check at the boarding gate as required... Same regulation apply on flights back to Hong Kong from USA/Europe or Taiwan...
For all flights to other destination, there is no restriction on liquid being brough onboard... You can bring as much as you need onboard if you wish... Through the usual security check, they will not be checking on liquid so as long as you are not flying to USA, this would not be a problem... Anf for all flights to Europe or Taiwan, there is no restriction on liquid as well...
So depending on where you are traveling to... There is different regulation and basicily from Hong Kong, there is no liquid restrictions unless you are flying to USA... But when you fly back to Hong Kong, same restrictions as USA on liquid will apply at Europe and Taiwan...
If you are flying unfortunitely to USA, then you will need to put all liquid inside your check-in baggage... However, you can get liquid product at duty free after security which can be bought onboard...

無錯無錯，最主要係因應你目的地同出發地而決定架，但現在一般情況下，例如帶一樽水，關檢員會要求你即場飲俾佢地睇囉，至於Lotion，眼藥水，問題也不大，一般都可以帶，但細細枝囉，必要時，關檢員亦會要求你即場測試