I have been to Antarctica twice. The second time we also visited South Georgia. I took similar equipment both times. While I agree with others about spare batteries, gloves and not changing lenses outside, I disagree with other points. I wouldn't take a tripod, useless on a ship, difficult to handle/not useable in a zodiac, extra carriage and unnecessary ashore. When you go on an Antarctic expedition you will transfer between ship and shore by Zodiac, you may also cruise around icebergs in a Zodiac. So, you will be walking on shore and you will take photos from the zodiac (icebergs, whales, seals, penguins). You will also take pictures from the ship of both scenery and wildlife. My solution (and I was super happy with it both times) is two cameras, two lenses. I take a full frame camera with a 24-70 or 24-105 and a crop body with 100-400 lens. (Yes, get the 7DII). I carry them in Lowe Pro top loader bags (which can accommodate spare batteries and cards), one for each combo. The two camera/lens combos in the small bags allowed flexibility, were easily manageable in the zodiacs and not bulky. Your warm weather clothes are already bulky so I don't find a back pack convenient. (You wouldn't wear a backpack in the zodiac anyway, so it has to go on your lap or floor). I carry Rugged or Op/Tech rain sleeves (pack of 2 for about $6) in each bag and, if I know I need weather protection, I use Aquatech rain covers or Storm Jackets. I never had any equipment failures, not even shooting in poor conditions or getting splashed in the Zodiac. You go out twice a day, weather permitting, for just 2-3 hours so charge batteries and download cards twice a day. You need the gear to cover the different shooting opportunities (penguins can come close to you or be far away on an iceberg) that is ready to use and easy to carry. Have your gear ready and warm weather clothes ready all the time on ship because you could suddenly get a call from the bridge that something special has been sighted (e.g. a pod of whales). Someone mentioned wellington boots and rain pants. I don't find these warm enough. Look for Arctic Muck Boots (available on Amazon) and snow pants. Don't forget long underwear. The expedition folks will give you a packing list. Hope this helps.
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