is that water inside of it? or Gel?

i am guessing gel. lasts longer than water

How long do these stay frozen in a cooler?

I have a large soft-sided cooler bag that I used these in and they stayed cold for 6 hours. While they didn't stay frozen, they were still cold and kept the food/drinks cool. Let me add that the temperature outside was also 95!! So, they worked quite well for me.

How long do these take to freeze when fully thawed? Also how long do these stay frozen I have a big lunch bag that I but milk, yogurt, and such in

I'm not sure, I know when I out in freezer at night and wake up they are frozen. I used them in my cooler bag to take pizza from Ohio to Oklahoma on my flight. The flight is usually 5 to 6 hours and my food is still cold

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Description

❄️ Stay cool, stay fresh—wherever life takes you!

EXTENDED COOLING POWER - Keeps your food and drinks chilled for hours on end
VERSATILE EVERYDAY USE - Perfect for office, school, camping, and breast milk storage
SAFE DURABLE MATERIALS - Made from BPA-free, non-toxic gel for peace of mind
TSA FRIENDLY CONVENIENCE - Passes through security frozen or packed in checked luggage
SLIM LIGHTWEIGHT DESIGN - Fits seamlessly in lunch boxes and coolers without bulk

This set of 4 slim, reusable gel ice packs measures 7 x 4.7 x 0.5 inches each, designed to keep your cooler bags and lunch boxes cold for extended periods. Made from BPA-free, non-toxic materials, these lightweight packs are TSA-approved for travel and versatile enough for everyday use—from office lunches to outdoor adventures.