Beanie hat or other insulated hat
Never go to bed with wet socks or boots on
If it's really cold, you should dry off feet before bed and put on a pair of dry clean socks
This will keep your feet warmer at night
Your feet are also ready to go if you have to put your boots on and leave your shelter
In extreme cold environments, you will need insulated booties
If your bag is inadequate to protect you against the cold, wear extra clothing to bed
Roll up jacket to use as pillow - it will be warm in the morning and is already in your bag
6x8 Tarp found in hardware and big-box stores
Use as waterproof ground cloth
Protects gear from melted snow
Protects gear from sinking into snow and disappearing until summer
Many other uses
Emergency shelter or sled
Use as tarp to cover gear and protect it from snow
Pulk cover/burrito
Use as hasty waterproof/windproof blanket
Small section of closed-cell foam
Use to sit on, stand on, place pot on or added to main pad for additional layer of insulation
Empty bottle for collecting urine at night
Should be different color AND different shape than water bottle
Use outside of your sleeping bag but inside shelter
Medium sized bottle with large opening
Powerade bottle from Dollar Store works great (28-32oz)
Remove label so you don't confuse it with lime flavored electrolyte drink - YUK!
Anything smaller than 28oz risks overflow
Some people will use am old Nalgene bottle
Do NOT use a metal bottle for a Pee Bottle in subfreezing temperatures!
Some adults will need a 36oz bottle
You know who you are
One large bottle is better and safer than 2 smaller ones
LED Lantern or Headlamp - ideally both
A candle (with or without lantern) used to be a thing
OK light source prior to LED lanterns
An open flame in a shelter poses the risk of setting gear on fire
Melted wax also melts snow under candles and ruins gear
This method is no longer encouraged in Scouting
Wrap around lantern or flashlight so you can find it at night
Nice to know what time it is when deciding if you can sleep in some more or need to get up