Ironstripe Sleeping Bag Bivy Sack Military Green 2-Pack — Extra-Large 94 x 48 in, Thermal Mylar & Hood

Ironstripe's extra-large bivy sack is a tear- and puncture-resistant emergency sleeping bag with thermal Mylar, a built-in hood, and a compact carry bag — supplied as a 2-pack with an emergency whistle for reliable warmth and visibility in survival situations.

This oversized emergency bivouac bag combines heavy-duty polyethylene fabric with a reflective THERMO-MYLAR lining to trap body heat while resisting rips, punctures, and moisture. At 94" x 48" (240 x 125 cm) it gives more coverage than standard emergency blankets and fits most adults comfortably, including room for gear. The integrated hood boosts heat retention and the whole system compresses into a small drawstring pouch for storage in your pack, car, or home emergency kit.

How does this bivy sack keep you warmer than a standard emergency blanket?

The Ironstripe bivy uses a reflective Mylar interior designed to redirect radiated body heat back toward the user, retaining the majority of warmth. A sewn-in hood reduces heat loss around the head, one of the fastest points of thermal escape, and the extra-large dimensions let you huddle with clothing or equipment for added insulation.

• THERMO-MYLAR lining reflects about 90% of body heat.
• Built-in hood adds roughly 10% more heat retention.
• Oversized 240 x 125 cm interior allows layering and gear inside.
• Sealed seams reduce heat escape and limit drafts.

Is the Ironstripe bivy durable and weatherproof enough for rough conditions?

Yes — the outer shell uses extra-thick PE material that resists tearing and punctures better than thin foil blankets. The material and seam construction block wind and rain, keeping you dry in storms, snow, and heavy condensation situations typical in outdoor emergencies.

• Reinforced seams increase tensile strength and longevity.
• Waterproof PE outer layer shelters from rain and snow.
• Puncture-resistant construction holds up against rocks and debris.
• Designed for multi-season use down to around freezing conditions.

How compact is the bivy for packing and repeated use?

The bivy compresses into a small drawstring storage bag for easy stowage in backpacks, vehicles, or home disaster kits. Because it’s made of robust PE and Mylar, it can be unfolded and refolded multiple times without immediate failure, making it suitable for training, drills, and real emergencies.

• Folds into an ultra-compact drawstring pouch for travel.
• Durable materials allow repeated deployment and packing.
• Lightweight design keeps kit weight low while maximizing coverage.
• Two-unit set provides a spare or allows team/partner use.

What safety extras come with the survival bivy set?

Each Ironstripe set includes two bivy sacks plus an emergency whistle so you can signal rescuers if needed. The reflective Mylar also makes the sack more visible to search teams when light hits the surface, and the bright storage bag helps locate the kit quickly.

• 2-pack provides redundancy or a second shelter for companions.
• Included emergency whistle aids in audible signaling.
• Reflective exterior increases visual detection potential.
• Bright carry pouch speeds retrieval in low light.

Who is this for: The Ironstripe Bivy Sack is intended for hikers, campers, drivers, preppers, search-and-rescue volunteers, and anyone assembling an emergency kit who wants a durable, high-coverage, compact backup shelter. It’s especially useful for those who need a low-weight, reusable thermal shelter that performs better than thin single-use blankets and fits easily into packs, glove boxes, or evacuation bags.