Pack or skip
Packable down jacket for Busan in December
Verdict
Pack it
Lows around 37°F — the packable puffer covers 90% of layering needs.
Why
Busan in December averages highs of 50°F, lows of 37°F, 5 rainy days.
That climate means a packable down jacket earns its space in the bag. Lows around 37°F — the packable puffer covers 90% of layering needs.