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Pack of ten orange rectangular mylar bivy sacks with drawstring stuff sacks

Sierra Madre ESP-10 Emergency Sleeping Bag Pack of 10

SKU CH-R4VP-RM2XB

Pack of ten ultralight mylar bivy sacks reflect 90% of body heat and weigh 1.642 kg total

  • SizeMedium
  • Color familyBeige
  • Length, width and height213.36 L x 91.44 W x 7.62 H centimeters
  • Product colorBeige
  • Age groupAdult
  • Key featuresBelow minus 5 degree Celsius, All Seasons, Polyethylene (PE)
  • Reflects 90% of body heat for extreme cold survival
  • Waterproof and windproof Mylar shields against rain and snow
  • Ultralight 6-ounce design packs into drawstring stuff sack
  • Durable PET construction allows multiple uses across emergencies
  • Pack of 10 supplies group kits and extended preparedness

Emergency Bivy Pack for Survival Kits

This pack contains ten ultralight emergency sleeping bags built for one adult each. The polyethylene material reflects 90 percent of body heat to help prevent hypothermia in cold conditions. Each bag is waterproof and windproof, making it suitable for bug-out bags, vehicle kits and hiking packs. The drawstring stuff sack allows quick storage and reuse.

Upgrade from Single-Use Foil Blankets

Unlike thin metallic blankets that tear after one use, these bivy sacks are constructed from durable PET material rated for multiple deployments. The rectangular shape and 213.36 by 91.44 centimetre dimensions provide full-body coverage for more body types. The jump is worth it when a household, team or expedition needs reliable, reusable shelter that fits in a glove compartment or daypack.

Limits of Passive Heat Retention

The bag relies entirely on reflecting the user's own radiant heat, so it cannot generate warmth in prolonged sub-zero exposure without an external heat source. Condensation can build up inside the non-breathable polyethylene shell during extended use. At 1.642 kilograms for the full ten-pack, the weight is minimal but not zero, and the packed volume still requires dedicated space in a kit.

How it compares

Measured against everything we stock in Utility & Everyday Bags, at today’s prices. Recalculated every night.

Price $68.99
Pricier than about 90% of the 2,172 comparable items (median $23.99).

Specifications

Product
Brand nameLowepro - Wynit
Model nameESP-10
Product colorBeige
Color familyBeige
Size & build
SizeMedium
Length, width and height213.36 L x 91.44 W x 7.62 H centimeters
Main materialPolyethylene (PE)
Product weight1.642 kg
More details
Age groupAdult

Questions about this item

How much packed space do the 213.36 cm by 91.44 cm bags need in a rucksack?

Each bag weighs 1.642 kg and compresses into its own drawstring stuff sack, so ten units fit in a medium pack without crowding other kit.

What is the correct way to deploy the drawstring closure so heat does not escape?

Pull the cord tight around your shoulders after sliding in, then tuck the excess inside the collar to seal the 90 % reflective layer against drafts.

How many times can the polyethylene material be refolded before it tears?

The PET construction is rated for repeated folding; shake out debris, wipe damp surfaces dry, and store loosely in the stuff sack to maximise reuse cycles.

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