Imagine a sleeping bag that combines advanced technology with sustainability, providing comfort in cold weather while being lightweight and easy to carry. Here's why the ATEPA ELEMENTS 450 Coldmaster™ Down Mummy Sleeping Bag is perfect for your next adventure:
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3D Box Quilting: Expertly designed to optimize down fluffiness and thermal insulation. The three-dimensional structure ensures maximum warmth by forming a breathable cavity between layers, enhancing insulation while reducing overall weight.
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Unique Down Blend: Filled with Coldmaster™ Down, 450 grams of high-performance down and cotton blend—55% premium 90/10 down and 45% ball cotton. This combination offers the warmth of down while minimizing moisture absorption, ensuring you stay cozy in all conditions.
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Durable Yet Lightweight Fabric: Made with 20D nylon and 15D nylon that is both tear-resistant and water-repellent. This high-density fabric reduces the weight of the sleeping bag without sacrificing durability and is easy to clean.
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Perfect Fit: Sized at 220×80-55 cm (86.6×31.5-21.7 inches), the bag fits most standard sleeping pads, providing a snug, insulated experience while reducing cold spots.
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Comfort-Oriented Design: Features include a 3D foot compartment that conforms to your body, a drawstring hood for warmth, and arc quilting that reduces the movement of filling, preventing cold spots even when you sleep on your side.
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Eco-Friendly & Sustainable: The sleeping bag uses renewable ball cotton, a recycled material that is environmentally friendly. The unique down mix is designed for high resilience, lightweight comfort, and superior warmth in tough outdoor conditions.
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Adjustable Comfort Levels: With a comfort rating of 6°C (42.8°F), a limit temperature of 1°C (33.8°F), and an extreme rating of -14°C (6.8°F), this sleeping bag offers versatile performance across a range of temperatures.
Specifications Table:
| Feature | Details |
|---|---|
| Size | 220×80-55 cm (86.6×31.5-21.7 inches) |
| Weight | 1 kg (2.2 lbs) |
| Fabric | 15D 480T Nylon Plaid (Recycled) |
| Lining | 20D 400T Nylon Plain Weave (Recycled) |
| Filling | Coldmaster™ Down 450g |
| Outer Bag Fabric | 100% Polyester (210D Oxford cloth) |
| Comfort Temperature | 6°C (43°F) |
| Limit Temperature | 1°C (34°F) |
| Extreme Temperature | -14°C (6.8°F) |
This sleeping bag is your ultimate companion for staying warm during cool-weather adventures, while being eco-friendly, compact, and lightweight.









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| Temperature Rating | Comfort: 42.8°F (6°C) Limit: 33.8°F (1°C) Extreme: 6.8°F (-14°C) | Comfort: 39.2°F (4°C) Limit: 30.2°F (-1°C) Extreme: 3.2°F (-16°C) | Comfort: 53.6°F (12°C) Limit: 44.6°F (7°C) Extreme: 26.6°F (-3°C) | Comfort: 42.8°F (6°C) Limit: 33.8°F (1°C) Extreme: 6.8°F (-14°C) | Comfort: 44.6°F (7°C) Limit: 35.6°F (2°C) Extreme: 10.4°F (-12°C) | Comfort: 53.6°F (12°C) Limit: 44.6°F (7°C) Extreme: 26.6°F (-3°C) |
| Unfolded Dimensions | 86.6 x 31.5 inches | 88.6 x 35.4 inches | 78.7 x 33.5 inches | 78.7 x 33.5 inches | 86.6 x 29.5 inches | 74.8 x 29.5 inches |
| Packed Dimensions | 13.78 x ø7.48 in | 14.17 x ø7.87 in | 11.8 x ø6.7 in | 13.78x ø7.87 in | 13.4 x ø6.7 in | 13 x ø6.3 in |
| Capacity | 1 Person | 1 Person | 1 Person | 1 Person | 1 Person | 1 Person |
| Weight | 1KG (2.2 LBS) | 1.5KG (3.3 LBS) | 1.15KG (2.5 LBS) | 1.52KG (3.4 LBS) | 1.2KG (2.65 LBS) | 0.5KG (1.1 LBS) |
| Filling Material | Coldmaster™ Down 450G; Down Fill Power: FP700 (US Standard) | Coldmaster™ Down 600G; Down Fill Power: FP650+ (US Standard) | Coldmaster™ Down 300G; Down Fill Power: FP650+ (US Standard) | Coldmaster™ Down 360G; Down Fill Power: FP700 (US Standard) | Coldmaster™ Down 400G; Down Fill Power: FP650+ (US Standard) | Coldmaster™ Down 300G; Down Fill Power: FP650+ (US Standard) |
| Filling Weight | 450g | 600g | 300g | 360g | 400g | 300g |
| Features | Mummy‑Style Fit – Body‑hugging design reduces heat loss. | 1. Extra‑Wide & Extended Size; 2. 3‑Way Sleep System: Bag, Blanket, Poncho; 3. Detachable Hood – Add or remove warmth as needed; customize your sleep setup; 4. Two Bags Zip Together into a Double. | 1. 3‑in‑1 Convertible System – Use the top as a solo blanket; attach the bottom sleeve to your own inflatable pad; 2. Expanded 3D Foot Box – Extra space at the foot‑section connection gives your feet room to move. | 1. 3‑in‑1 Versatility – Use it as a full sleeping bag, a standalone blanket, or attach it to your favorite inflatable pad; 2. Detachable Top Layer – Converts instantly into a solo blanket for lounging or warmer nights; 3. Roomy 3D Foot Box – Extra volume gives your feet space to move; foot section can be fully opened. | 1. 3‑Way Sleep System: Bag, Blanket, Poncho; 2. Detachable Hood – Add or remove warmth as needed; customize your sleep setup. | 1. Two Bags Zip Together into a Double; 2. 2‑Way Function – Use it as a cozy sleeping bag or unfold it into a soft, practical blanket. |
| Shell Fabric | 15D 480T Nylon Ripstop (Recycled) | 20D 400T Recycled Nylon Taffeta(Down‑proof treated, Water‑Repellent Grade 4) | 20D 400T Recycled Nylon Taffeta(Down‑proof treated, Water‑Repellent Grade 4) | 20D 400T Recycled Nylon Taffeta(Down‑proof treated, Water‑Repellent Grade 4) | 20D 400T Recycled Nylon Taffeta(Down‑proof treated, Water‑Repellent Grade 4) | 100% Nylon, 15D |
| Lining Material | 20D 400T Nylon Taffeta (Recycled) | 20D 400T Recycled Nylon Taffeta(Down‑proof treated, Water‑Repellent Grade 4) | 20D 400T Recycled Nylon Taffeta(Down‑proof treated, Water‑Repellent Grade 4) | 20D 400T Recycled Nylon Taffeta(Down‑proof treated, Water‑Repellent Grade 4) | 20D 400T Recycled Nylon Taffeta(Down‑proof treated, Water‑Repellent Grade 4) | 100% Nylon, 15D |
| Outer Bag | Compression Sack | Compression Sack | Compression Sack | Compression Sack | Compression Sack | Compression Sack |
| Shape & Fit | Mummy | Rectangular / Envelope | Semi-rectangular | Semi-rectangular | Rectangular / Envelope | Rectangular / Envelope |



































