There is a great article in Walk Highlands that I recommend you read no matter how experienced you think you are!
Preparation – One of my tips is to prepare your route I even have my back up GPS with prepared bearings ready just as a back up.
Eat on the move – I have some easy to eat food handy in my pockets ready to eat on the move.
Whats your favourite hill food
Goggles – the time you need them in a blizzard it’s to late to realise you do not have them.
A watch – Many folks do not wear one now and really on phone ? Or am I wrong ? I still think a watch is essential on the hill. If the phone dies on you ? Comments welcome .
Look at weather and avalanche forecast’s.