Vango Cobra 600 Down Sleeping Bag Review (2025): UL 4‑Season Warmth with Real EN/ISO Numbers

If you need real sub‑zero performance without a huge pack size, the Vango Cobra 600 is one of the sharper buys in the 600‑gram down class. It pairs 700‑fill 90/10 goose down with welded box‑wall baffles, a 20D 380T nylon shell, and Vango’s reflective Thermal‑Reverb lining to hold warmth efficiently. Crucially, its temperature claims are EN/ISO 23537 tested (Comfort −5 °C, Limit −12 °C, Extreme −30 °C), so you’re not guessing when the forecast dips.

If you need real sub‑zero performance without a huge pack size, the Vango Cobra 600 is one of the sharper buys in the 600‑gram down class. It pairs 700‑fill 90/10 goose down with welded box‑wall baffles, a 20D 380T nylon shell, and Vango’s reflective Thermal‑Reverb lining to hold warmth efficiently. Crucially, its temperature claims are EN/ISO 23537 tested (Comfort −5 °C, Limit −12 °C, Extreme −30 °C), so you’re not guessing when the forecast dips.

How warm is it—really?

Numbers only matter if you can hit them in the field. In practice, the Cobra 600’s Comfort of −5 °C feels honest provided you pair it with an insulated mat (R‑value ≈ 3.2–4+), sleep in dry base layers, and shield the bag from wind. The box‑wall construction maintains loft when you shift positions, while the Thermal‑Reverb lining helps keep micro‑drafts from stealing heat. If your camps routinely drop well below −10 °C, consider moving up a class—or add a liner and warmer pad for margin.

Packability, weight & fit

At ~1.1 kg with a pack size around 24 × Ø18 cm, the Cobra 600 disappears into a winter pack more readily than most synthetics with equivalent warmth. The mummy cut fits users up to ~190 cm with an internal chest width ~75 cm and foot ~48 cm—snug enough for efficiency, but not a torpedo tube. Side‑sleepers with broad shoulders may still prefer a roomier “GT/Alpine‑wide” alternative, but most hikers will find the Cobra’s ergonomics balanced.

Materials & build quality (the confidence bits)

The 20D 380T nylon shell is down‑proof and water‑resistant for tent condensation and brush‑by moisture. Welded box‑wall baffles minimise cold spots versus stitch‑through designs, and a stiffened anti‑snag zip baffle makes night‑time venting painless. Long‑term care is simple: store it loose in the mesh sack to preserve loft, and only wash with down‑specific detergent when necessary.

Where the Cobra 600 shines

Cold shoulder‑season treks, lightweight winter overnighters, and any trip where you value verified warmth in the lowest possible volume. The bag’s left/right zip options and compact packed size make it a pragmatic upgrade from bulky car‑camping bags when you start pushing further from the trailhead.

What we’d change (and who should skip)

You’re buying goose down + UL fabrics, not a bombproof expedition shell. Expect to baby the fabric around rough granite and campfire sparks. If you often bivvy in sustained wet conditions, a high‑end synthetic or a heavier, more water‑resistant down bag could be the smarter call. Ultralight obsessives who need a roomier cut might prefer wider 600‑gram competitors for true side‑sleep comfort.

Bottom line

The Cobra 600 delivers trustworthy EN/ISO‑rated warmth to −5 °C in a ~1.1 kg package that packs small and punches above its price. For hikers stepping into four‑season ambitions without the penalty of a giant stuff sack, it’s a standout choice.

Where to Buy

• Amazon