- I would leave behind the SAS survival guide book.
That would be blasphemous!! For the small weight gain in carrying this book, I have used it more times then I can remember over the years. An added benefit, some pages can be used for fire starter if need be.
Well said! It's a great book and if nothing else it will give you something to read.
There's actually a "Collins Gem" edition of this book which I have in my BOB. It's rather small, and only weighs about 200g
Also, here's a little ultrarunning trick:
Duct tape works better than moleskin. It sticks well, prevents chafing, and doesn't add much bulk which can actually exaggerate hot spots in a shoe. Preventative duct taping before blisters form is best so get it on there the moment anything starts rubbing, but even if you have to drain a blister before applying - it will patch you up and let you keep going.
In a pinch, those empty energy gel packets are also really good for reducing friction and preventing blisters. Just put them between your sock and shoe.