Mandatory
Hiking shoes
Water - at least 1.5L
First aid kit (gauze, bandages, plasters, sanitiser, blister plasters, isothermal blanket, etc.)
Energy snack
Juice (and/or tea, if it will be cold)
Sweatshirt
Headlight (if the hike is at night)
Optional
Hiking poles
Spare T-shirt/socks
Hat (if it will be cold)
Neck warmer (if it will be cold)
Rain jacket (if the weather is unstable)