I'm looking to buy these for vegas heat (110+). in a coleman 16 quart cooler. would they stay cold 5 hours at least?

I kept 2 of mine in a small lunch cooler under my desk in an air conditioned room and they didn't stay cold for more than 8 hours. Outside in the heat? No way these ice packs are a joke.

Is the volume of "liquid" in each of these small enough to carry on an airplane?

I'm not sure how much the liquid is in the chillers by volume, but I would guess that it is. Though I'm not sure what the rules are when it is in a frozen state since technically, it's no longer a liquid. You'd probably have to check with the TSA on that.

Where are these made?

I have looked all over the ice pack and I could not find where it was made. There are things like :non toxic, do not put in dishwasher, wash only with soapy water. What I did not see was "Made in China". So I really don't know for sure. I have other ice packs that stated they were made in China, so maybe these are not. Sorry that I couldn't be more help.

I see they have what appears to be a cork at the top, can they be refilled?

No - they are not meant to be refilled.

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❄️ Stay cool, stay fresh, and never compromise on space!

ALL DAY FRESHNESS - Keeps your meals and drinks chilled for hours, ensuring freshness from morning to evening.
SAFE SUSTAINABLE - Made from BPA-free, non-toxic materials that are reusable and easy to clean for eco-conscious users.
PERFECT COMPATIBILITY - Specifically designed to fit Bentgo bags but versatile enough for most lunch boxes and coolers.
EFFORTLESS MAINTENANCE - Simply wash by hand and refreeze—ready to keep your food cool again and again.
SPACE SAVING SLIM DESIGN - Ultra-thin profile fits seamlessly in any lunch bag or cooler without sacrificing space.

The Bentgo Ice Pack 4-pack offers ultra-slim, reusable cooling solutions designed to fit perfectly in Bentgo and most other lunch bags. Measuring just 6.5 x 4.25 x 0.3 inches, these BPA-free, non-toxic ice packs keep your food chilled for hours without taking up valuable space, making them an essential accessory for the modern professional on the go.

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Manufacturer	Bentgo
Model Number	BGOICE-B
Package Dimensions	16.7 x 11.2 x 6.4 cm
Material	Plastic
Color	blue
Size	6.5" x 4.25" x 0.6" each
Special Features	Freezer Safe, Leak Resistant
Package Weight	0.79 Kilograms
Batteries Required	No
Batteries Included	No
Material Care Instructions	Hand Wash Only
Brand Name	Bentgo
Item Weight	1.7 Pounds

Bentgo アイスパック4個セット冷凍食保存用超薄型ブルー na

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Bentgo アイスパック4個セット 冷凍食保存用 超薄型 ブルー na

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Bentgo アイスパック4個セット冷凍食保存用超薄型ブルー na