One Sleep System, Three Ways to Use It. Your Ultimate Bag for Every Season.
Introducing the ATEPA BULWARK 300 – the sleeping bag that adapts to your adventure. Unlike rigid mummy bags, our innovative 3-in-1 system gives you the freedom to use it as a standalone top quilt, attach it to your favorite sleeping pad, or zip it up as a traditional sleeping bag. Filled with a 300g blend of 650+ fill power down and recycled cotton, this versatile bag is built for backpackers, campers, and outdoor enthusiasts who demand comfort, adaptability, and quality in any season.
Why the 3-in-1 BULWARK 300 is Your Smartest Gear Choice:
✅ UNIVERSAL 3-IN-1 CONVERTIBLE DESIGN
Stop buying separate gear for different trips. The BULWARK 300 is three systems in one:
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A Top Quilt: Detach and use the top as a breathable, lightweight blanket for warm nights or van camping.
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A Pad Cover: Securely attach the integrated sleeve to your existing inflatable pad (standard 20"-25" width) for a stable, integrated sleep system.
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A Full Sleeping Bag: Zip it up completely for traditional, cozy protection on cooler nights.
✅ PERFECTLY BALANCED FOR 3-SEASON COMFORT
Engineered with a 51% down / 49% recycled cotton blend, this bag offers the perfect balance of loft, moisture resistance, and eco-conscious materials. It’s comfort-rated to 53.6°F (12°C) with a lower limit of 44.6°F (7°C), making it your go-to for spring, summer, and fall adventures where nights can be unpredictable.
✅ DESIGNED FOR REAL-WORLD COMFORT & DURABILITY
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Expanded 3D Foot Box: No more cramped toes. Our foot box design gives your feet room to move, improving circulation and overnight comfort.
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Stays-In-Place Baffles: Cross-quilting and 3D baffle construction prevent down from shifting, ensuring even warmth distribution all night long.
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Full-Zip Versatility: Unzip it completely for use as a blanket, or zip it up with the draft flap and adjustable hood for a snug, windproof seal.
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Eco-Tough Materials: Made with a 20D 400T recycled nylon shell (water-repellent & down-proof) that’s durable, easy to clean, and kinder to the planet.
✅ ULTRALIGHT & COMPACT FOR BACKPACKERS
Weighing only 2.5 lbs (1.15 kg) and compressing to 11.8" x 6.7", the BULWARK 300 packs down small without sacrificing warmth or features. The included 210D compression sack makes packing effortless.
Technical Specifications:
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Temperature Rating (ISO): Comfort: 53.6°F (12°C) | Limit: 44.6°F (7°C) | Extreme: 26.6°F (-3°C)
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Fill: 300g Coldmaster™ Blend (51% 650+ FP Duck Down, 49% Recycled Cotton)
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Weight: 2.5 lbs (1.15 kg)
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Packed Size: 11.8" x 6.7" diameter (30 x 17 cm)
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Unfolded Size: 78.7" x 33.5" (200 x 85 cm)
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Shape: Semi-Rectangular with 3D Foot Box
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Fabrics: 20D 400T Recycled Nylon (Shell & Liner)
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Included: Sleeping Bag, Compression Sack
Ideal For:
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Versatile Backpackers who camp in varying conditions and want one adaptable bag.
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Pad Users who hate sliding off their pad and want a secure, integrated sleep setup.
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Minimalist Travelers who need a compact bag that can also be a quilt or blanket.
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Eco-Conscious Adventurers who prioritize performance and sustainability.
Stop limiting yourself to one type of sleep. The ATEPA BULWARK 300 3-in-1 Convertible System is the only bag you’ll need for most of your adventures.
🛌 Choose Your Configuration. Add to Cart and Experience Versatile Comfort!
Compare ATEPA Sleeping Bags - Coldmaster™ Down Series
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$119.99
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SEATTLE 300
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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 |
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