My longest trip was 9 days and I used what gear I had, rather than anything approaching an ideal. Most extravagant were the OS 1:25,000 maps. These are big and heavy, even with the covers off and despite being double-sided. No one really needs that much navigational precision but I like looking at them. I had four inside the pack and the current one in the pocket or in an inverted poly bag in my hand.
Other items included a RAB Quantum 200, a Cave 1, a small, light Thermarest, the footprint from an Akto to keep mud off everything else, a Kathmandu 2x2 bivy bag, a mini Trangia set, Lexan fork and spoon, flint and small Swiss Army knife, Silva compass, Field and Trek carbon poles, fuel bottle in one mesh pocket and water bottle in the other. This trip at Easter 2005 brought some very challenging and varied conditions but I never once regretted taking the Jam with a tarp instead of a tent.
I often mountain bike with the Jam and have gone out overnight with the bicycle. I left out waterproofs and added a spare inner tube and a multitool. This was such fun, I can't think why I have not done it again. Many days of proper cycle touring in France probably took away the need.