Best Overall Bivy Sack & Best Bang for the Buck
MSR AC Bivy
With an unmatched combination of low weight and small packed size, and strong scores in other metrics, the MSR AC Bivy
is our Editors' Choice and Best Buy Award Winner. Most people who use a bivy are willing to accept some sacrifices in other factors to gain the benefit of low weight and small packed size. It allows you to take on an overnight adventure with the lightest and smallest pack possible and yet still offers robust weather protection. While it is best used in situations where weather is likely to be good, given that other bivy's like OR Alpine Bivy
will be comfier in sustained rainy weather or winter use, the AC is no foul weather slouch and can do the job when poor weather rolls in. Given the crucial importance of weight and packed size to most bivy users, we think the MSR AC is an ideal choice.
Top Pick for Weather Resistance
Outdoor Research Alpine Bivy
The Outdoor Research Alpine Bivy
came out on top when you factor in weather resistance and comfort despite higher weight. When making the move from a tent to this bivy, expect storm-proof comfort and 4-season capability from this heavily featured workhorse. While it should be noted that if you will primarily be camping in warm or dry environments, the MSR AC Bivy
or an ultra-light tents or tarps such as the Big Agnes Fly Creek 2 Platinum
might be strong alternatives, but if you need versatility or the best lightweight 4-season protection, great ventilation and comfort, then the OR Alpine is worth every ounce. There may be some taller or broader folks who might find the 26" shoulder width too narrow, but the floor-to-ceiling height, which allows for easy tossing and turning without feeling pinned below fabric, might make up for it.