Patagonia Down Sweater Hoody is the most popular premium down jacket for backpacking. We looked at how pack size and warmth compare to the synthetic Arc'teryx Atom LT.
Who it's for
Buy this if: Dry-environment hikers who want maximum warmth-to-weight with excellent pack size.
Skip this if: Wet-environment hikers — down loses insulation value when damp.
In practice
800-Fill Compression
800-fill down: 800 cubic inches per ounce. The Down Sweater Hoody weighs 12.7 oz and compresses to 8x6 inches — the size of a thick paperback book. Synthetic equivalent warmth at same size: 20-24 oz. For summit packs and daypack side pockets where space is limited, the compressibility advantage is significant.
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