Not sure if this is the right forum..

Recently returned from 4 weeks away in USA/UK/Europe and thought I'd share some experiences on travel gadgets I used/took:

Travel router - worth its weight in gold, especially if there is a group/family travelling.  Instead of setting up multiple devices to use new wifi at each location, you just plug this into an existing router, or connect it to a hotspot, and your whole family/group immediately has wifi.  Plus, client isolation is 'off' in your private WLAN, so you can use Chromecast etc.  And it neatly circumvents any client number restrictions that you find in some hotels

Multi-port USB charger (eg the Anker 5-port) - lets you carry one travel adapter and charge all your USB-powered devices quickly

3 UK SIM card - 10UKP gets you a similar bundle to the NZ $19 ones, except you can roam for free in many countries inc USA, NZ, Aus.  Only downside is that in UK, Three's network coverage is far from great so it's actually better when you're roaming

Laptop - still the only way I know of to safely back up hundreds/thousands of photos when travelling.  I suppose if you used microSD cards in the camera, you could use a suitable tablet and a OTG cable

Bluetooth car hands-free kit - took one but never used it; all hire cars seem to have bluetooth built in these days

Bluetooth speaker - I took a Jabra Charge speaker, and while it was nice on the odd occasion I used it, I'm not sure if it's worth its weight in the baggage

Anyone else have useful tips for travellers?