Vango Nitestar Alpha 350 Sleeping Bag (Excalibur) image 1

Vango Nitestar Alpha 350 Sleeping Bag (Excalibur)

£39.99(inc VAT) £60.00
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  Product Description
The Vango Nitestar Alpha 350 sleeping bag sits in that sweet spot where proper warmth meets packable convenience. Built around Alpha insulation, which blends standard polyester with siliconised hollow fibres, it traps air both between and within the fibres themselves. That siliconised coating does two useful things: stops the insulation from clumping up after repeated stuffing into its bag, and adds a degree of water resistance if condensation builds up inside your tent. The offset construction layers the shell and lining with staggered stitching, so you don't get those cold lines running across your back at 3am when temperatures drop. It's ISO 23537-1:2022 certified, which means the comfort and limit ratings you see have been tested to proper industry standards rather than guesswork.

This mummy-shaped bag tapers from shoulders to feet, cutting down on dead air space that your body would otherwise need to heat. The 3D hood shapes around your head rather than just cinching flat, and there's an insulated shoulder baffle with drawcords for those nights when you need to seal everything up tight. The two-way auto-lock zip lets you crack open the foot section for ventilation without the whole bag unzipping itself while you're asleep. Zip guards and anti-catch piping mean you're not wrestling with snagged fabric at bedtime, and there's an insulated baffle running the full length behind the zip to block heat loss. Small touches like the internal pocket for your phone or headtorch, plus hanging loops for airing it out, make regular use more practical.

The Polair Hex fabric on the outside is a 68D polyester with an embossed finish that resists abrasion from tent groundsheets and rucksack bases. Inside, you get 190T brushed polyester microfibre that feels soft without being slippery. It's on the Duke of Edinburgh's Award Recommended Kit list, which tells you it's designed to handle multi-day trips where weight and packed size matter. This synthetic sleeping bag is built for real-world adventures—retaining its warmth and loft even when damp, drying quickly, and offering excellent long-term value. Its reliable insulation makes it a great companion for three-season camping in the UK or summer wild camping trips when the temperature drops at night. Warm, durable, and easy to look after, it delivers comfort and performance without weighing you down.

Vango Nitestar Alpha 350 Sleeping Bag Features


  • Polair® Hex Fabric - A strong, durable yet soft touch 68D polyester shell fabric with an embossed hex grid finish.
  • Polair® Fabric Lining - A super soft and comfortable 190T brushed polyester microfibre lining that's incredibly warm and soft to touch
  • Alpha Insulation - A lightweight 50/50 blend of polyester and siliconised hollow fibres that trap more air between and within the fibres to increase warmth retention whilst retaining compressibility. A siliconised coating reduces friction to prevent insulation clumping and increases water repellence.
  • Offset Construction - A double layer design that offsets the shell and lining stitching to reduce cold spots and increase warmth retention.
  • Mummy Shaped Sleeping Bag - Tapers from the shoulders to the foot, reducing pack size and increasing thermal efficiency
  • 3D Hood - Anatomically shaped to provide greater comfort and reduce heat loss. A convenient drawcord closure allows for flexible adjustment in varying temperatures.
  • Horizontal Stitching - Evenly spaced to hold insulation in place and ensure even distribution throughout
  • Insulated Shoulder Baffle - Helps retain heat within the sleeping bag. A convenient drawcord closure allows for flexible adjustment in varying temperatures.
  • Zip Guard with Anti-Catch Piping - Helps to prevent the zip from snagging on the lining, allowing easy opening and closing
  • Insulated Zip Baffle - Prevents heat from escaping along the zip, reducing cold spots within the sleeping bag.
  • Auto-Lock Two-Way Zip - Seals in warmth and provides adjustable ventilation. Auto-lock prevents the bag from opening during the night and can be accessed from inside the bag
  • Woven Zip Puller - Allows you to quickly and easily move the zip
  • Internal Pocket - Provides convenient storage for small items
  • Hanging Loops - Allows you to easily hang your bag for quick and easy drying
  • ISO 23537-1:2022 Certified - Extensively tested to meet industry standard temperature ratings

Specifications
  • Weight : 1.93 kg
  • EN13537 Comfort : -1 °C
  • EN13537 Extreme : -25 °C
  • EN13537 Limit : -7 °C
  • Suggested Usage Max : 18 °C
  • Suggested Usage Min : -5 °C
  • External Chest Width : 85 cm
  • External Foot Width : 50 cm
  • External Length : 210 cm
  • Maximum User Height : 190 cm
  • Internal Chest Width : 83 cm
  • Internal Foot Width : 48 cm
  • Sleeping Bag Shape : Mummy
  • Performance : 3-4 Season
  • Fill Type : Insulite Alpha
  • TOG Rating : 10.5
  • EAN : 5059474017101
  • Colourway : Excalibur

Frequently Asked Questions


What temperature rating does the Nitestar Alpha 350 have?
The Nitestar Alpha 350 is ISO 23537-1:2022 certified with laboratory-tested temperature ratings. The comfort rating typically suits users down to around 5°C, while the lower limit rating extends to approximately 0°C for more experienced campers who sleep warmer. The extreme rating goes lower but represents survival conditions rather than comfortable sleep. These ratings assume you're wearing base layers and using a sleeping mat with adequate insulation underneath.
How does Alpha insulation compare to down filling?
Alpha insulation uses a 50/50 blend of polyester and siliconised hollow fibres instead of down. It won't compress quite as small as equivalent warmth down bags, and it weighs slightly more gram for gram. The trade-off is that synthetic insulation maintains most of its loft when damp, dries faster if it gets wet, and costs less to buy and maintain. The siliconized coating on the fibres helps prevent clumping and adds water repellence, addressing the main weakness of older synthetic fills.
What size sleeping mat works with this mummy bag?
The Nitestar Alpha 350 has a mummy taper that fits standard rectangular and tapered sleeping mats up to about 65cm wide at the shoulders. Most regular-width camping mats between 50cm and 65cm wide work fine. The bag is designed to reduce excess space around your body for better thermal efficiency, so oversized mats wider than 70cm might extend beyond the bag's footprint at hip level.
Can you zip two Nitestar Alpha bags together?
The Nitestar Alpha 350 can zip together with another Nitestar Alpha bag if one has a left-hand zip and the other has a right-hand zip. You need opposing zip configurations for the zips to mate together properly. Check which version you're buying as both left and right zip options are typically available in the range. Zipping bags together does reduce overall warmth retention compared to using them individually.
How do you properly store a Nitestar Alpha between trips?
Don't store the Nitestar Alpha compressed in its stuff sack long-term as this degrades the insulation's loft over time. Hang it loosely in a wardrobe or under a bed using the hanging loops, or store it in a large cotton storage sack where the insulation can maintain its full loft. Make sure it's completely dry before storage to prevent mildew growth on the lining. Air it out for a few hours after each trip before putting it away.
What's the packed size and weight of the Nitestar Alpha 350?
The Nitestar Alpha 350 packs down to approximately 25cm x 20cm when compressed into its stuff sack, though exact dimensions vary slightly depending on compression technique. Weight sits around 1.4kg to 1.6kg depending on the specific model year, which makes it suitable for backpacking trips where you're carrying all your gear. It's light enough for Duke of Edinburgh expeditions where participants need to manage their pack weight over multiple days of walking.
How do you wash a Vango Nitestar Alpha sleeping bag?
Wash the Nitestar Alpha in a front-loading washing machine on a gentle cycle at 30°C using technical wash designed for synthetic insulation. Top-loading machines with agitators can damage the offset construction. Use minimal detergent and run an extra rinse cycle to remove all soap residue. Tumble dry on low heat with clean tennis balls to help break up clumps and restore loft, or hang dry away from direct heat sources. Never dry clean as solvents damage the siliconised coating on the fibres.
Why is the Nitestar Alpha recommended for Duke of Edinburgh Awards?
The Duke of Edinburgh's Award scheme recommends the Nitestar Alpha range because it balances appropriate warmth ratings for UK expeditions with manageable weight for young participants carrying full packs. The ISO certification means temperature ratings are reliable rather than optimistic, and the synthetic insulation performs better than down when kit gets damp during multi-day trips. The construction quality stands up to repeated packing and unpacking by less experienced campers learning expedition skills.
EAN-13 : 5059474017101
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If you’ve changed your mind about keeping your purchase, please return it in its original condition with proof of purchase and we’ll exchange or refund it. Unless faulty, this should be within 100 days of receiving your order. By original condition, we’d expect this to mean that you’ve kept packaging and labels, and that the item is undamaged and unused.

For further information of how to return your item, please visit the "Returning an Unwanted/Faulty/Damaged Item" section on our Help Page.
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