Will this function as a freestanding bivvi, or does it need to be staked down to work properly?

I just spent the weekend in mine, it does not need to be staked down. It is stable with the poles alone, but it is very light weight and the wind will blow it around easily if not weighted down or staked.

Does it leave you wet with perspiration in the morning (adequate ventilation)? Doesn't look like it breaths much.

I've used mine only once and it was not in rainy weather. Didn't have trouble with perspiration but maybe that was because of the good weather. IN general, I think that if you use the little aluminum tent poles and have sort of a tiny tent over your head and leave your head far enough out so you're not breathing inside the bag you won't have much condensation.

12"×5"×1". My, thats helpful... I'm 6'2, guess I wont fit in this 12" Long bivy then, right?

I'm increasingly finding vendors selling gear here on Amazon and posting nonsensical dimensions information. Makes one wonder why and how they are still in business if they don't pay attention to details. I recently pointed out that a full sized tent was listed as being 1"x1"x1", and got a reply from the seller explaining that the dimension is, in fact, 1"x1"x1" ... he didn't use his brain one bit. Totally bizarre.

what are the actual dimensions of this bivy when it is fully deployed. one seller reports two different sets of measurements, one set being 90x37x42?

Not going to measure it, But if you are 6-2 and 240 your at about the max if your using a winter bag.

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Description

🌧️ Stay dry, stay light, stay ahead with Stratosphere Shelter!

BREATHE EASY - No-See-Um mosquito net and mesh ventilation prevent bugs and condensation
BUILT TO LAST - Aluminum poles with screw lock tips and taped seams ensure durability
COMPACT READY - Packs down to a sleek 12x5 inch size for minimalist travel
FEATHERLIGHT FREEDOM - Weighs just 2.5 lbs for effortless carry on any adventure
WEATHERPROOF WARRIOR - 5000mm PU-coated ripstop nylon keeps you dry in severe conditions

The Snugpak Stratosphere is a 1-person bivvi shelter designed for serious outdoor professionals who demand ultralight, compact, and fully waterproof protection. Featuring a 5000mm waterproof PU-coated ripstop nylon outer, breathable mesh ventilation, and a rollaway No-See-Um mosquito net, it balances weather resistance with comfort. Weighing only 2.5 pounds and packing down to a minimal size, it’s perfect for hiking, camping, and tactical use. Included is a comprehensive repair kit and durable aluminum poles, making it a reliable shelter for 4-season adventures.

Specifications

Brand	Snugpak
Product Dimensions	91"L x 32"W x 20"H
Item Weight	1.6 ounces
Floor Width	39.3 Inches
Recommended Uses For Product	Camping & Hiking
Shape	Rectangular
Occupancy	1 Person
Seasons	4 Season
Included Components	Snugpak Stratosphere Bivvi One Person Shelter Olive
Water Resistance Technology	5000 Mm
Special Feature	fluid-oz
Occupant Capacity	1
Design	Bivy Sack
Material	Nylon
Color	Olive
Sport	Airsoft
Age Range (Description)	Adult
Installation Type	Free Standing
Product Care Instructions	wipe down
Pole Material Type	Aluminum
Size	One Size
Closure Type	Zipper
Number of Doors	1
Fabric Type	Nylon
Floor Length	12 Inches
Maximum Height	20 Inches
Floor Area	2730 Square Inches
Base Material	Polyurethane
Number Of Poles	1
Style	Tactical
Water Resistance Level	Waterproof
Number Of Pockets	1
Number of Rooms	1
Minimum Trail Weight	36.29 Ounces
Stake Material	Aluminum
Tent Floor Material	Nylon
Support Pole Attachment Mechanism	Clip
Number of Vestibules	1
Number of Guylines	1
Number of Stakes	6
Rainfly Material	50D 190T 100% nylon ripstop with (5000mm HH) waterproof polyurethane coating
Is Waterproof	True
Ultraviolet Light Protection	Some UV light protection
UPC	744288964707 745369233439 751738910559 854585793587 000000127967 782174235340
Form Factor	lightweight, waterproof, 1-person bivvi tent
Model Name	92860
Global Trade Identification Number	08211650300132
Manufacturer	Gun Accessory Supply
Item Package Dimensions L x W x H	13.82 x 8.43 x 5.16 inches
Package Weight	1.25 Kilograms
Item Dimensions LxWxH	12 x 5 x 1 inches
Brand Name	Snugpak
Country of Origin	China
Warranty Description	One year from date of purchase
Suggested Users	unisex-adult
Number of Items	1
Part Number	92860
Outer Material	Polyester
Fill Material Type	Polyester