As much as I loathe the headline style on list sites, there's a couple of good ones in there (as well as some nonsense).

Carrying straws full of white powder on international flights may not be the best idea.

Muji do a great line in travel bags with refillable containers - very much worth looking into.

Google Maps offline is useful - but Ulmon CityMaps2Go (actually covering lots of areas outside cities) has been a wonderful resource for me when travelling! With GPS, of course.

I am very tempted to try the hanging organiser. When you're travelling to multiple hotels on a trip (I inevitably do - I get itchy feet very quickly) it could make life much easier. Hmm, maybe a stop at Ikea at the weekend...