Can you cut it to make it fix several RV windows?

Absolutely. A razor blade or moderately sharp scissors will easily cut it. I cut it into 20x46" panels to insulate the inside of my metal garage door. Just one heads up: if you ever want to affix it to vinyl (say a vinyl coated metal garage door...) be sure to use vinyl adhesive. The other stuff won't work.

How temporary is this product? I want to use it on huge bedroom windows, but be able to remove it when the temp is mild.

It will be as temporary as whatever you use to affix it to the window is. There is no adhesive on this product. This is like the stuff used to make sun visors for car windshields. Think bubble wrap with silver covering. It is very sturdy and you should be able to reuse it many times.

Would this make a good heat reflecting layer for under your sleeping bag, in your tent?

Yes. YouTube camping/survival guru ReallyBigMonkey1 demonstrates how tough Reflectix is and uses it to layer with a welding blanket to make a really stout survival blanket/tarp. Plenty of Bushcraft/Hiking people use Reflectix mats under their sleeping bags or pads.

I want to line a roosting box (a community nesting box for birds in the winter, they huddle to share warmth) with this. Would it work to trap heat?

I think the fact that it has some insulation (like a padded mailer) would help trap heat. And it would work for sure if you added a heat source like Maryanne suggested. I feel sure that the Reflectix would keep the air warmer than foam. I've tried using a thick foam padding to insulate a dog house. The cold wind blew through small cracks in the dog house and eventually seeped through the foam because there was no barrier. The Reflectix is a padded barrier.

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🛠️ Insulate smarter, not harder — Reflectix keeps your space perfectly balanced!

ECO FRIENDLY SAFE - Environmentally safe materials ensure a sustainable choice without compromising performance.
ULTIMATE HEAT DEFENSE - Reflects up to 97% of radiant energy, keeping your space cool or warm with unmatched efficiency.
VERSATILE APPLICATION - Perfect for crawl spaces, attics, walls, metal buildings, and post-frame structures—adaptable to your project needs.
EFFORTLESS INSTALLATION - Fiber-free and lightweight design means no protective gear needed—get professional results without the hassle.
LAYERED STRENGTH DURABILITY - Seven engineered layers combine aluminum foil, polyethylene, and bubble pack for superior insulation and resilience.

Reflectix BP48010 is a 48-inch by 10-foot reflective bubble pack insulation featuring seven layers of aluminum foil and polyethylene that reflect 97% of radiant heat. Lightweight, fiber-free, and easy to install without protective gear, it’s designed for versatile use in crawl spaces, attics, walls, and metal buildings, providing durable, eco-friendly thermal protection across a wide temperature range.

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Global Trade Identification Number	00716511340008
Manufacturer	Reflectix
UPC	716511340008
Part Number	BP48010
Product Dimensions	25.4 x 60.96 x 25.4 cm; 907 g
Item model number	BP48010
Size	1 Pack
Item Package Quantity	1
Coverage	40 square feet
Batteries included?	No
Batteries Required?	No
Item Weight	907 g

Reflectix BP48010 48 in. X 10 ft. Bubble Pack Insulation

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