| Size: | Regular | Long |
| Weight: | 1 lbs 8.77 oz (702 g) | 1 lbs 12 oz (794 g) |
| Insulation: | 850-fill Goose Down | |
| Fill Weight: | 11 oz (312 g) | 13 oz (369 g) |
| Shell Fabric: | Pertex Microlight 20 Denier Nylon Mini Ripstop DWR 1.1 oz/yd |
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| Lining Fabric | Pertex Microlight 20 Denier Recycled Polyester Mini Ripstop DWR 1.0 oz/yd |
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| Fits to: | 6' 0" (183 cm) | 6' 6" (198 cm) |
| Shoulder Girth: | 62" (157 cm) | 64" (163 cm) |
| Hip Girth: | 58" (147 cm) | 60" (152 cm) |
| Foot Girth: | 40" (102 cm) | 42" (107 cm) |
| U.S. Temp Rating | 30°F (1°C) | |
| EN Comfort | 39.2°F (4°C) | |
| EN Lower Limit | 29.8°F (-1.2°C) | |
| EN Extreme | 1°F (-17.2°C) | |
| Color | Hemlock | |
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| Marmot Hydrogen Regular size with 5'11" model inside. | Regular size Hydrogen with zipper fully open. |
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| Model with hood cinched around head. There is one hood cord on the left for hood adjustment and a zipper garage for zipper on the right. Velcro-free Face Muff keeps dracord and zipper away from your face. | 2-way zipper allows venting at the bottom of the sleeping bag. |
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| Close-up of the zipper opened revealing the two zipper guards (blue arrows) and the large insulated draft tube (red arrow). | Milk jug filled with water to 1.5" weighs the same as the regular sized Hydrogen in it's stuff sack. |
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