Go light weight. What do you really need? Use merino, B&B, dedit card. Most people carry luxuries not essentials.
Kit list all fits in Mule
Camelbak hydration, tubeless kit, mutli tool, gortex jacket
debit card £20 note
power bars
trackster bottoms so I can get out of muddy shorts
Ipod for music
Garmin GPS + spare batts
toothbrush
Off the bike I wear a short sleeve merino that I used as base layer for riding, gortex and tracksters and use the washing facilities at B&B. Merino sox’s dry almost instantly. Im pretty fit so a power bar seems me through and or I grab any food I can on the way. My main concession is that I aim to do my long distance stuff in good weather as I want to enjoy the route.