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The Trek is Sea to Summit's three-season down bag for campers and casual backpackers who want warmth without a mummy bag's squeeze. It uses 650+ fill-power RDS-certified duck down in a tapered-rectangular cut, so side sleepers get room to bend their knees. The Free-Flow zip system lets you open the foot and shoulder areas separately for venting on mild nights. It is heavier and bulkier than premium 800-fill mummy bags, but it undercuts them on versatility and roominess.
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Availability unknownSold by jar-9855 (100% positive, 53 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Availability unknownSold by danivfis_0 (95.7% positive, 63 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
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Lowest price we've seen: $241.08 on Nov 9 at InWild US. Tracked across 15 stores since Nov 9.
Owners rate it highly, praising the roomy cut, the flexible zips and the warmth for a 30°F bag. The main complaints are packed size and weight against lighter mummy bags.




