How long do they stay cold when in a temperature retaining cold bubble mailer?

If it's packed well, I think at least 12 hours if not more. Maybe 24.

do you have to freeze it first? or do you crush it for it to be cold?

Freeze it. It is a reusable ice pack.

Do you know the weight of one gel pack? For shipping purposes

I really do not know. They are not at all very heavy. A couple ounces maybe. Maybe only 1. There are 96 in a box, perhaps the weight of the box is online.

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Description

❄️ Stay cool, stay ahead—because your perishables deserve the best chill!

FOOD SAFE ASSURANCE - Made with non-toxic, food-safe materials, so you can trust it for all your health and beauty cold therapy needs.
COMPACT CONVENIENT - Slim 5" x 2.75" x 0.75" size fits easily into any cooler or shipping package without bulk.
BULK READY FOR BUSINESS - Case of 96 packs ensures you’re always stocked and ready to extend shipping times or manage first aid demands.
ULTIMATE COLD RETENTION - Specially formulated gel stays colder longer than traditional ice, ensuring your perishables remain fresh and safe.
ECO FRIENDLY ECONOMICAL - Leak-proof and reusable design means less waste and more savings—perfect for sustainable professionals.

The ICE-BRIX IB3BPD Cold Pack is a 3 oz, leak-proof, reusable refrigerant pack designed to stay colder than ice using food-safe, non-toxic gel. Measuring 5" x 2.75" x 0.75", it’s ideal for keeping perishables fresh or extending shipping times. Sold in a bulk case of 96, it’s the economical and eco-friendly choice for professionals seeking reliable cold therapy and shipping solutions.