I believe that there are 4 pieces of kit which are absolute essentials and form the backbone of my kit on any expedition, whether instructing DofE students or out in Nepal climbing Everest. These are boots, sleeping bag, rucksack and waterproofs. Having comfy feet, being toasty in the coldest conditions, feeling my backpack is robust enough for the jobs ahead, staying dry and warm on the inside in the harshest of weather – and knowing that this kit will not be a liability – is key to me being at my best in any situation.