Is cotton really that bad in the cold?

Yes. Once cotton gets wet from sweat or snow, it stays wet and drains body heat, which significantly increases the risk of hypothermia.

How do I deal with wet gear at the end of the day?

Pack a few plastic 'wet bags' or dry bags to separate damp base layers from the rest of your luggage so they don't mildew during transit.

Packing Cold Weather Gear for Families

Prioritize a three-layer system—base, mid, and shell—and compress bulky items using vacuum-seal bags to save space. Pack identical-colored accessories like hats and gloves for everyone to simplify tracking and ensure you don't lose pairs.

Use the Three-Layer Rule. Every family member needs a moisture-wicking base layer (merino wool or synthetic, never cotton), a fleece or down mid-layer for heat retention, and a windproof/waterproof outer shell. This allows you to adjust to changing temperatures without stripping down completely.
Maximize Compression. Use hand-pump vacuum bags for puffy jackets and snow pants. You can reduce their volume by 50-60%. Place these flat at the bottom of your suitcase.
Wear Your Bulk. Have everyone wear their heaviest boots and thickest coats on the plane. This frees up massive amounts of weight and room in your checked or carry-on luggage.
Group Accessories. Use individual packing cubes for each person's accessories (hats, gloves, scarves). If you color-code these cubes by family member, you avoid the 'where is my glove' chaos at the hotel.

Is cotton really that bad in the cold?: Yes. Once cotton gets wet from sweat or snow, it stays wet and drains body heat, which significantly increases the risk of hypothermia.
How do I deal with wet gear at the end of the day?: Pack a few plastic 'wet bags' or dry bags to separate damp base layers from the rest of your luggage so they don't mildew during transit.