Is the 6.5x11 busy or flat? Looking for one to lay on for back pain

They're all flat and most people can lay on them just fine - if too cold, just take a hand towel, run it in hot water, and then put it over the pack before laying on it - allows you to "ease" into the cold. Also, try strengthening your multifidus muscles for your back pain - see Jim Johnson's stenosis book.

Can this be microwaved and also used for heat pain relief

No, it is used as a cold pack (filled with jell) only.

What is the shelf life of an ice packs packs used by/in physical therapy?

Jane; I am not a PT nor do I have PT professional ties. I had back surgery in 1996, neck surgery in 1996, back surgery in 2005 and back surgery in 2009. I ordered 3 of the black (heavier duty) ColPac's back in 1996 and have used them for pain relief (sometimes several times a day, sometimes not for several weeks but they all reside in my freezer). My first and only ColPac leaked recently (this year) because of my improper use (i applied ColPac then put my back brace over it with pressure and fell asleep). It had a small leak so I trashed it (my fault). The other 2 Colpacs purchased at the same time are still functioning like the day I bought them in 1996. I purchased 3 more just recently to have as backup (I have OCD), but I would say from my experience shelf life has been almost 18 years and still functioning like new. I suggest only buying the black (heavy duty) which seem to be for commercial use, and see them in most PT facilities. Nice thing about these is you apply them and the coldness wears off about 20-25 minutes after applying, so you can fall asleep using them without worrying about keeping the cold on too long and burning your skin. The relief for me has been awesome! Hope this helps! Regards, Bill S

Directions say don't lay on it, but I'm uncomfortable lying on my stomach (lower back issues). Has anyone had problems lying on it on a bed?

My PT suggested this and wants me to lay on it 30 min on then 30 off and so on. I lay on 3 XL ones during PT every time I go for 30 min at a time. Was specifically told to "lay on it". I just make sure to put something between it and myself and no big deal. Yes they do get very cold and stay cold so I would suggest no more than 30 min at any one time and make sure you have a barrier between it and your skin. I even wear a t-shirt with a tank top underneath so I have another 2 extra layers of protection when I use it on my back post back surgery.

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Description

❄️ Chill like a pro — relief that fits your active lifestyle!

DURABLE SLEEK - Black polyurethane exterior resists wear and looks professional in any setting.
VERSATILE THERAPY - Perfectly contours to back, thigh, hamstring, and shoulder aches for multi-area use.
LIGHTWEIGHT PORTABLE - Weighing just 453g, it’s easy to carry for on-the-go cold therapy.
MAXIMIZED COOLING COVERAGE - Oversized 12.5" x 18.5" design targets large muscle groups for faster relief.
TRUSTED AMERICAN CRAFTSMANSHIP - Manufactured in the USA ensuring quality and reliability you can count on.

The Chattanooga ColPac Reusable Gel Ice Pack offers oversized cold therapy with a durable black polyurethane cover, designed to provide targeted relief for back, thigh, hamstring, and shoulder aches. Made in the USA, it combines professional-grade quality with portability, making it an essential recovery tool for busy professionals seeking fast, effective pain and inflammation management.

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