What is in them that makes them colder than ice?

Don’t buy this. Mine cracked after a month and I had the gelatinous sludge leak all over my lunch. It sucks!

How much water do you add? What if I don't have a measuring cup?

It comes with an instruction sheet that tells you exactly how to set them up. I seem to remember 28 ounces. Even comes with a cool little funnel. "Don't have a measuring cup",8oz. to a cup, take an empty water/soda bottle or can and do some math.

Are the 3 packs and 5 packs, the same size?

No the 3 packs last twice as long as the 5 pack

Does these ice packs waterproof?

If you have the cap on tight, they have been great.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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SUNLUGReusable Ice Packs for Lunch Bags, Long Lasting Small Freezer Packs for Lunch Box，Lidless and Easy Cleaning

Product ID: 605527124

R4295

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

SUNLUGReusable Ice Packs for Lunch Bags, Long Lasting Small Freezer Packs for Lunch Box，Lidless and Easy Cleaning

Specifications

Item Package Dimensions L x W x H	8.66 x 7.2 x 2.44 inches
Package Weight	0.8 Kilograms
Item Dimensions LxWxH	7 x 6.5 x 0.5 inches
Item Weight	1.76 Pounds
Brand Name	SUNLUG
Color	4 Pack - Lunch Box Ice Packs
Material	Plastic
Suggested Users	unisex-adult
Number of Items	4
Manufacturer	SUNLUG
Included Components	4 ice packs
Size	Small

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