Hyperlite Mountain Gear Square Flat Bivy

Because it's built from Dyneema Composite Fabric, it lands around a pound depending on size, versus roughly double that for a comparable silnylon tarp. That low weight is the main reason ultralight hikers pay the DCF premium.

It's a floorless rectangular tarp that supports many pitches — A-frame, plow point, lean-to, and more — and you'll need trekking poles (or separate poles) plus stakes, since none of that ships with the tarp. Its configurability is the point: one shelter covers rain, wind, and bug-free star-gazing setups.

No — it's floorless with no netting, so in buggy conditions you pair it with a bug bivy or head net. Many HMG users combine it with a lightweight bivy sack for exactly that reason.

DCF doesn't stretch when wet, absorbs essentially no water, and has an excellent strength-to-weight ratio, so your tarp stays taut through a storm instead of sagging like silnylon. The trade-offs are cost and less abrasion tolerance, which matters given Hyperlite, a Maine-based company, prices these as premium gear.