As you can see there are no hard and fast rules in any of this Ultra Running game. One thing I would say though is it really helps to know yourself. Sounds like long compression leggings work for you. Hydration is also a very personal issue (some like plain water and salty foods, some use hydration tabs such as NUUN tabs). Just to make things more confusing you may switch preference halfway into a run. As you start actually running over say 5 hrs you will start to learn for yourself. Stay flexible in your approach but keep in mind that Ultras are addictive! If choosing a pack, is it comfortable on you? A smaller pack will be a few grams lighter but may not be large enough for your second or third ultra which may have a minimum gear list. If your pack is not full it will wobble about and rub but bubble wrap will sort this out without adding weight. It may be worth choosing a 15 l pack that will give you more options.
Its also worth adding that most of the posts on the whole forum are from folks who have gravitated towards Ultras from a running /racing background.( the focusing on PB,s and minute miles is still important) The reality of running in ultras is that racing is not what it is about for most of the field. You need to find your comfortable sustainable pace rather than your fastest sustainable pace. This pace will also be effected by how you eat drink and in longer Ultras even sleep. Getting to the end of a race and the friends you will have made on the way will seem far more important than your time. This is especially true for fell/mountain ultras. If you do get hooked (as most do if they can spare the time) you may find yourself running along a mountain ridge as dawn breaks more tired in body than you could imagine but with your soul more alive and receptive to the wonder of the world than ever before. Perhaps its this that keeps me going and I hope that you will experience this running ultras.
Edited: 26/02/2012 at 12:13