A little bit like a plastic grocery sack

Can you wash these and reuse??

I would say no. They are sprayed aluminum on 1 side, so washing would remove this, leaving only a plastic sheet, which would not keep you warm.

What is the mil thickness of this compared to the regular ddity mylar sheet?

One of the product images says that they are 28 micrometers thick. That's about 1 mil. I've seen other ads claiming that the cheaper space blankets are 12 micrometers. This plastic is noticeably stronger than the polyethylene used in trash bags and painter's drop cloths.

I know they are for outdoor use but any reason they couldn't be used as a travel blanket when flying?

While I've not experienced an emergency where I used these particular mylar blankets, I do recall that earlier versions of the disposable shiny mylar blankets were quite "crinkly," that is they were noisy. If these create that same annoying noise, your fellow passengers my not enjoy that disturbance. If, indeed, they are silent then their use aboard an airplane should be okay.

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Description

🛶 Don’t just survive—thrive with the world’s toughest emergency blankets!

SURVIVE IN STYLE - Thicker, flexible HeatFlex mylar outperforms ordinary space blankets for ultimate warmth and durability.
HEAT RETENTION MASTERY - NASA-designed thermal foil reflects up to 90% of your body heat, preventing hypothermia in any weather.
PACK LIGHT STAY READY - At just 2.5 oz per blanket and compact storage, these ultralight blankets fit effortlessly in any emergency kit or backpack.
ECO CONSCIOUS PREPAREDNESS - 1% of sales support global conservation, so you protect nature while protecting yourself.
VERSATILE SURVIVAL ESSENTIAL - Convert blankets into shelters, sleeping bags, or bivys with simple gear—your all-in-one outdoor lifesaver.

The World’s Toughest Emergency Blankets 4-Pack features ultra-durable, extra-thick HeatFlex mylar that reflects 90% of body heat while weighing only 2.5 oz each. Designed for outdoor pros and survivalists, these waterproof, compact blankets come with ripstop nylon sacks and a carabiner zipper pack for easy carry. Perfect for hiking, camping, first aid, and emergency kits, they transform into shelters or sleeping bags and support conservation efforts with every purchase.

Specifications

Material	mylar
Colour	Woodland Camo
Brand	Don't Die In The Woods
Special Feature	Durable, Lightweight, Tear Resistant, Waterproof
Style	Modern
Blanket Form	Emergency Blanket
Age Range (Description)	Adult
Product Dimensions	15.2L x 10.2W Centimeters
Theme	Space
Pattern	Camo
Recommended Uses For Product	Camping, Hiking, Travel
Seasons	All
Fill Material	HeatFlex Mylar
Product Care Instructions	Hand Wash Only
Size	7 x 4 ft
Fabric Type	Mylar
Net Quantity	4.0 Count
Number of Items	4
Item Weight	68 g
Item Thickness	28 Micron
Included Components	ripstop nylon stuff sack, nylon zipper pack with carabiner
Fabric Warmth Description	Lightweight
Sport	Hiking
Water Resistance Level	Waterproof
UPC	041964691248
Manufacturer	Don't Die In The Woods
Item model number	Pro Emergency Blanket 4 Pack
ASIN	B088XQJJWQ

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