This is my first time seeing such a limit. You can only keep your item below the seat. You have to pay to keep your bag in overhead stowage compartment.

Which Airline? HKExpress?

yes

if not ultralite became how much?

bugsbunnyno.jpg

Yes Singapore day trip lul. Still intl

add 30 if u wanna keep in overhead.
you can check hkexpress.com

airasia charge u to bring extra hand carry as well. but syukur la, so cheap can go hk. thanks to stonk myr

Fly ultralight (not in this package) but didn't bring anything except my ipad to Perth. Bought some clothes in Target and spend few days there.

Possible. If just 1-2 days trip

1-3 days trip doable with one 20L backpack

lol, arrive at destination kena question why bring so little luggage by the immigration

AA don't charge me to keep my item at overhead.

farkin HK, after CCP takeover all go downhill.......

now flyin also kena cramp.

20L backpack can fit underneath seat?

can, 20L is not really that big TBH

if just a business trip with a backpack n overnight stay, is ok.

1 day trip doable

with woman not going to happen

Yes - very easy. I did a one month trip with 34L Osprey carry on that weighed less than 8kg. Of course different proposition if you are going to need nice clothes jewelry, cosmetics , electronics - but for most incidentals, even basic clothing, they can be bought cheap on arrival , everywhere so why pay the airline to transport them for you..