I'm running my first ultra in January 2009 and the rules say I need to carry the following items with me:
• Compass
• Hat or warm head cover
• Long Sleeved Top
•
Long Trousers
• Map case or waterproof bag for paper directions
• Personal food
• Safety pins (10)
• Space Blanket
• Torch: head torch, with spare batteries
• Waterproof Jacket
• Whistle
• Mobile Phone
Anyone have a suggestion for a small, lightweight backpack to carry these things????