ReviewsUltra Sil Day Packs

Sea to Summit Spark 28-Degree Ultralight Down Sleeping Bag, Regular

• 28-degree Fahrenheit (-2-degree Celsius) ultralight down sleeping bag for 2-season backpacking, bike packing, and touring.
• technical mummy shape features hood and zipper draft tubes.
• High-loft 850 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• Ultralight, compressible 10D nylon shell with 7D liner fabric for minimal weight and bulk.
• Contoured mummy shape provides adequate room for a natural sleeping position.
• baffle construction in the torso and sewn-through in the leg area.
• Regular size bag has a max user height of six feet.
• compresses to 2.5 liters with included Ultra-Sil compression sack.

Sea to Summit Ascent 15-Degree Down Sleeping Bag, Regular

• 15-degree Fahrenheit (-10-degree Celsius) down sleeping bag for 3-season backpacking.
• mummy style features shaped hood, draft collar, and zipper draft tube.
• 750 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• YKK zippers with full-length right-side zip, half-length left-side zip, and foot zip for ventilation and versatility.
• Relaxed mummy shape offers more room between hips and knees for a natural sleeping position.
• vertical baffles over the chest prevent down fill from shifting.
• Regular size bag has a max user height of six feet.
• compresses to 6.2 liters with included Ultra-Sil compression sack.

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Sea to Summit Trek 10-Degree Down Sleeping Bag, Regular

• 10-degree Fahrenheit (-12-degree Celsius) down sleeping bag for 4-season camping, backpacking, and trekking.
• mummy style features shaped hood and zipper draft tube.
• 650 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• YKK zippers with full-length right-side zip, half-length left-side zip, and foot zip for ventilation and versatility.
• Relaxed mummy shape offers more room between hips and knees for a natural sleeping position.
• vertical baffles over the chest prevent down fill from shifting.
• Regular size bag has a max user height of six feet.
• compresses to 8.4 liters with included Ultra-Sil compression sack.

Sea to Summit Trek 18-Degree Down Sleeping Bag, Regular

• 18-degree Fahrenheit (-8-degree Celsius) down sleeping bag for 3-season camping, backpacking, and trekking.
• mummy style features shaped hood and zipper draft tube.
• 650 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• YKK zippers with full-length right-side zip, half-length left-side zip, and foot zip for ventilation and versatility.
• Relaxed mummy shape offers more room between hips and knees for a natural sleeping position.
• vertical baffles over the chest prevent down fill from shifting.
• Regular size bag has a max user height of six feet.
• compresses to 6.1 liters with included Ultra-Sil compression sack.

Sea to Summit Spark 18-Degree Ultralight Down Sleeping Bag, Regular

• 18-degree Fahrenheit (-8-degree Celsius) ultralight down sleeping bag for 2-season backpacking, bike packing, and touring.
• technical mummy shape features hood and zipper draft tubes.
• High-loft 850 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• Ultralight, compressible 10D nylon shell with 7D liner fabric for minimal weight and bulk.
• Broad mummy shape provides adequate room for a natural sleeping position.
• baffle construction is fine-tuned to the temperature rating and prevents down fill from shifting.
• Regular size bag has a max user height of six feet.
• compresses to 4.6 liters with included Ultra-Sil compression sack.

Sea to Summit Spark 5-Degree Ultralight Down Sleeping Bag, Regular

• 5-degree Fahrenheit (-15-degree Celsius) ultralight down sleeping bag for 3-season backpacking, bike packing, and touring.
• technical mummy shape features hood and zipper draft tubes.
• High-loft 850 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• Ultralight, compressible 10D nylon shell with 7D liner fabric for minimal weight and bulk.
• Broad mummy shape provides adequate room for a natural sleeping position.
• baffle construction is fine-tuned to the temperature rating and prevents down fill from shifting.
• Regular size bag has a max user height of six feet.
• compresses to 6.6 liters with included Ultra-Sil compression sack.

Sea to Summit Ascent 25-Degree Down Sleeping Bag, Regular

• 25-degree Fahrenheit (-4-degree Celsius) down sleeping bag for 2-season, warm weather backpacking.
• mummy style features shaped hood, draft collar, and zipper draft tube.
• 750 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• YKK zippers with full-length right-side zip, half-length left-side zip, and foot zip for ventilation and versatility.
• Relaxed mummy shape offers more room between hips and knees for a natural sleeping position.
• vertical baffles over the chest prevent down fill from shifting.
• Regular size bag has a max user height of six feet.
• compresses to 4.9 liters with included Ultra-Sil compression sack.

Sea to Summit Ascent 0-Degree Down Sleeping Bag, Regular

• 0-degree Fahrenheit (-18-degree Celsius) down sleeping bag for 4-season, cold weather backpacking.
• mummy style features shaped hood, draft collar, and zipper draft tube.
• 750 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• YKK zippers with full-length right-side zip, half-length left-side zip, and foot zip for ventilation and versatility.
• Relaxed mummy shape offers more room between hips and knees for a natural sleeping position.
• vertical baffles over the chest prevent down fill from shifting.
• Regular size bag has a max user height of six feet.
• compresses to 8.2 liters with included Ultra-Sil compression sack.

Sea to Summit Spark 5-Degree Ultralight Down Sleeping Bag, Long

• 5-degree Fahrenheit (-15-degree Celsius) ultralight down sleeping bag for 3-season backpacking, bike packing, and touring.
• technical mummy shape features hood and zipper draft tubes.
• High-loft 850 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• Ultralight, compressible 10D nylon shell with 7D liner fabric for minimal weight and bulk.
• Broad mummy shape provides adequate room for a natural sleeping position.
• baffle construction is fine-tuned to the temperature rating and prevents down fill from shifting.
• Long size bag has a max user height of six feet six inches.
• compresses to 7.7 liters with included Ultra-Sil compression sack.

Sea to Summit Ascent 0-Degree Down Sleeping Bag, Long

• 0-degree Fahrenheit (-18-degree Celsius) down sleeping bag for 4-season, cold weather backpacking.
• mummy style features shaped hood, draft collar, and zipper draft tube.
• 750 fill power down insulation (Responsible Down Standard certified) treated with ULTRA-DRY Down to improve reaction to moisture, retaining loft and performance.
• YKK zippers with full-length right-side zip, half-length left-side zip, and foot zip for ventilation and versatility.
• Relaxed mummy shape offers more room between hips and knees for a natural sleeping position.
• vertical baffles over the chest prevent down fill from shifting.
• Long size bag has a max user height of six feet six inches.
• compresses to 10.2 liters with included Ultra-Sil compression sack.