Not sure if this qualifies as a “hack”, but I always try to fit everything into a single backpack when I travel, to avoid checking a bag. Aside from the obvious techniques of putting shoes on the bottom, storing rolled-up socks inside the shoes to save space, and wearing your bulkiest clothing on the flight, so you don’t have find a place for it in the bag, one of the best little hacks is utilizing the laptop pocket. If you’ve got dress shirts, or nice shirts for going out, which you don’t want to wrinkle, fold them up and slide them into the the thin laptop pocket. It keeps shirts pressed and neat, prevents wrinkling, and frees up space in the main compartment for other stuff.

I keep a bag of toiletries at home ready to go at a moment’s notice so I don’t have to try and remember anything while I’m packing. Just grab that bag and pack it. Everything is airplane regulation sized. I either bought the items that way or transferred them to smaller plastic bottles from the big jug. Every time I get my teeth cleaned, the hygienist gives me a travel-sized tube of Crest or Colgate. Into the bag it goes. I never run out. When I return from a trip, I refill everything, purchase new, whatever. There are too many details to remember when traveling. Trying to remember to pack my shampoo and deodorant are details I can skip. Just have to have doubles of everything: one for home and one for the bag.

My favourite one would be using Google Flights and Skyscanner to find cheap flights and using Booking to book hostels/hotels with free cancellation. Those two made my travelling waaay cheaper. I think everyone should know about this.

Definitely have to check that out Nofi.

Agoda, my favourite app to find cheap hotel, lots of discount and we can choose to pay later..

Julia, for guys, they can keep the cash in their sock.

For travel hacks, I recommend this: https://cloudten.wordpress.com/2018/06/30/123-ultimate-travel-hacks-some-youve-never-heard-of/