All participants in activities should have their own first aid kit. What you include depends very much on the activity itself and how much you can carry:
Crepe bandage roll
Gloves (in plastic zip lock bag)
Setopress bandage (for snake bites)
*An outcome of a Ramblers Club incident was that if any chest pain is experienced, 300mg aspirin should be given (to be chewed not swallowed) and an ambulance called immediately. Aspirin thins the blood and will help alleviate symptoms and minimise damage if there are potential heart issues until proper medical evaluation can occur. Note: Other blood thinners already being taken, eg Warfarin, should be taken into account.