Is the Mammoth warm enough for winter camping?

It is rated to -0° F, so it suits cold-weather car camping. Pair it with a pad, since the rating assumes insulation underneath.

Can two adults fit in it?

Yes. The double-wide mummy shape is made for two sleepers, and many owners use it as a shared bag.

It weighs 16.5 lb. That is fine from a car but too heavy for backpacking.

Yes, a stuff sack is included. Expect a large, bulky bundle even when packed.

That is the best new price found, at eBay as of November 5, 2026, and it is low for a sub-zero double bag. Check the price history before buying.

At eBay, for $76.98, 56% under what the other stores charge, as of our latest check.

Rated 4.7 out of 5 from 252 ratings.

4 stores we checked sell it, including eBay, Lowe's, Teton Gear, vminnovations.com.

4.7

$76.98at eBayVerified

56% under what the other stores charge

Compared across 3 stores. Prices are checked against each store and labelled with when.