I'm still not traveling the airlines yet, but I swear by Walmart's Yeti knock-off tumblers, Ozark Trail. They'll keep water cold for 24+ hours. I do have a Yeti magnetic lid on mine which keeps the spills to a minimum in normal use, even in turbulence in small planes. It'd probably leak if left it tipped on its side for awhile though.

Anyone who pays for a Yeti tumbler when they can buy the same thing from Walmart has money to throw away. Yeti sued Walmart several years ago because many so called Yeti camping supplies including the coolers were sold at Walmart under the Ozark label. They're the same thing .They were manufactured in the same facility in CHINA.. I have numerous of those tumblers all different sizes. Been using them for years. No rust no nothing. I've tried telling other people to avoid the Yeti name and the price and just order it off Walmart. But some people need the Yetis as a status symbol to get by in life 😀

Several years ago, I ordered from RTIC and received in the box a Yeti item back when the items were boxed. The factory placed the Yeti in the RTIC box. As part of the lawsuit settlement, RTIC sent a letter offering to replace my item with a genuine RTIC item.

I dont think so either, especially since it does virus as well. I have one and really like it.

I've been using the for a few months now, and I really like it. I bought it because I wanted a flat water bottle to fit in a jacket pocket, but I've been using it in the water bottle pocket of my backback as well and it's great. It's flat, so it's doesnt stick out; it slips into the pouch in an airplane seat very well too. I like it, because it's transparent on the bottom and top, so you can see when it's almost full. The cap is really nice, the mouth is very wide and the whole thing hasn't leaked even one drop. The only disadvantage is that it looks like you're taking a draught of liquor when it's really just water!

I use Zojirushi branded water bottles.Easily refillable and minimal weight. Keeps things cold for hours as well and fits in those backpack sleeves. It's usually the last thing I put in my carryon for easy removal at security (I do this automatically unless they specify otherwise). Then it's also easy to fill post security once I hit a fill station.

The only downside I find is some places (rarely, but it happens) use ice cubes (if I want to put ice in it) that are too big.for the mouth of the bottle. But this is rare.

Beware when flying via or out of PTY (Panama City, Panama)
 

There they don't let you take empty water bottles aboard, they are confiscated, no kidding! Mine was an empty plastic bottle, so no big loss, the girl in front of me had a metal thermos, probably 50 bucks or so. No chance! "Either you give us the bottle or you can't board the aircraft!" Again: the bottles were empty!
Explanation: "That's what USA requires". I discussed it with a very nice security officer in Spanish. Asking whether they do the same thing for flights to non-US destinations she told me "no, only the US requires this".
My explanation: Somebody badly translated US rules and now that bad translation is "law".

I carry a Katadyn Befree 0.6L a lot of the time. It's not insulated but I don't mind if my water is cold or room temp. On flights I just want to stay hydrated and more importantly fight off dry mouth. It's also filtered.

Though twice a year I meet up with teams from work for a week or two of meetings, and in those I drink a lot of coffee. For those trips I'll take my 20oz Hydroflask wide-mouth with the sipper lid. It'll keep the water cold during the flight and then during the week I'll have a nice hot coffee all day long.

Most Katadyn filtration systems...
 

...get damaged by chlorinated water, so not an ideal situation for flights/airports. I'm too lazy to check if that holds true for this one, but I have two of their systems and those mustn't come into contact with chlorinated water.

So first, there's nothing in the documentation for the BeFree bottles that suggests you can't use them with tap water... they just warn that the design (hollow tube design) doesn't filter out chemicals so don't use them with chemically polluted water expecting it to purify that water:

Which two do you have? I spent way too much time today looking through Katadyn user manuals and the only reference I found at all to Chlorine in any of them was to not clean the filters and such on the desalination products as "chlorine based cleaners" could damage the membrane (reasonable, and I don't know why you'd use a desalinator to filter tap water anyway)... but none of the hiker, or befree or survivor or other products mention anything at all about chlorinated water in any of the warnings...

The things with carbon would just have shortened filter life since the carbon would absorb the chlorine in the water and thus not be as effective in the long run. I'm legitimately curious though, which filters you have that would be damaged by tap water. (so I can avoid them for travel use and maybe pick up one for backpacking/camping as they are, I'm suspecting, ones that do some manner of anti-viral filtering.)

I'm sorry, but I can't come up with item numbers as I have been using these for many years. One is a fixed installation that filters drinking water in my house. The water comes from a clean stream, but goes through a tank so I can shut the main supply off when it rains and the water gets muddy.
The second one is a travel filter, that works with a gravity feed, one submerges it in a container with suspicious water and uses a receiving drinking water container that's 3 or more feet lower. Both work with carbon and silver from what I remember, the outside is ceramic material.
There was a warning on both of them to never use them with chlorinated water or it would damage the filters to a point where the outflowing water might no longer be safe to drink.