Hear me breathe a long sigh of relief as I finish zipping up the last pocket of my backpack, thus ending a two-day marathon of packing frenzy: I am DONE, and - miracle of miracles - IT ALL FITS (just)!It has been a puzzle figuring out what to cram into my 65-80L pack and small day bag, a challenge which is best summed up by this diabolical equation:Given C, a 27-year-old ...