Links to travel-related lifehack type posts/ideas

Because that way I can find them when I'm looking. Have you got any nifty ideas to add?

"35 Genius Travel Tips That Will Change Your Life Forever" (just a wee bit hyperbolic, ya think?)
"23 Awesome Travel Hacks That Add Fun To Your Trip"
"52 travel tips you really should know"
"Fifty best-ever travel tips"

• Use the USB slot on a TV to charge devices
• Take a USB hub, with power cables pre-plugged in and organised, or a multi-port charger (NB don't work with older Apple devices)
• invest in a battery pack (portable re-charger)
• Scan (rather than photocopy) important documents (eg passports etc) before leaving, then save them to iBooks or similar so you have offline access
• Take a photo of your hire car and its licence plate, in case you can't remember which one is yours. And drop a pin on your phone map app, so you can remember where you parked.
• Sew a washcloth into a pouch for soap, or toothbrush and toothpaste caddy
• When reserving seats for two people, book the aisle and the window - you're more likely to have the middle seat left vacant, else offer to swap with interloper.
• When you're at the airport, add "?.jpg" to the end of any URL to get around the ludicrously expensive WiFi. Or, try sitting right outside an airport club lounge
• Take your own water bottle - just empty it to go through security, fill it up when you get the chance
• Use ATMs to get currency - much better value than forex converters
• Shop for basic groceries when you arrive, not at the hotel, and also for picnic lunches
• download an offline foreign language dictionary app eg Google Translate
• when you start a new SD card on your camera, take a selfie makes it easier to prove it's yours when claiming it from lost&found (or, make the first one a photo of your business card and a request to mail it to that address if found).
• take a travel sized bottle of laundry detergent (and a multi-size sink plug) so you can wash jocks and socks in the hotel sink
• carry baby wipes/face wipes, and a stash of spare ziploc bags in a range of sizes (dirty laundry thru to snacks)
• use a button to keep earrings together
• apparently there's an outdoor rooftop swimming pool at Changi airport!
• a pashmina can double as a blanket; a sarong as a long skirt or a beach towel or a pillow
• take a small electronic luggage scale so you don't get caught out at the airport check-in
• remember to tell your credit card (and mobile phone) provider that you're heading overseas (so they don't cancel your cards due to suspected fraudulent activity)
• always remove all your luggage from the taxi before paying the fare (they can't drive off with it in case of a dispute)
• a bandana soaked in cold water and then tied around your neck will help keep you cool
• pack a skipping rope and a theraband as a mini-gym
• save maps for offline viewing (use 'OK Maps' in Google maps)
• carry enough medicines to cover unforeseen delays (volcanic ash clouds, anyone?)

(or: hide money in a tampon box - also unlikely to be rummaged through)