I wear a waterproof fanny pack that has the most common emergency tools in it: patch kit, spare tube, tire levers, multitool for bikes, digital luggage scale. Added to the belt of it are a pair of Husky brand tool belt pouches (that have a Velcro belt loop, rather than sewn, so I can remove it from the belt without taking the belt off): my wallet, smartphone, keys, semi-needle-nose-pliars-multi-tool ... anything I want to always keep with me. If the bike or packs gets stolen while I'm away from it, at least I'll still have something. If it starts raining, there's room in the fanny pack for the things I keep in the pouch. Originally I came up with this setup for work, but it works great on the bike! None of the weight is on my back.
Likewise, I improvised a pack system. Standard panniers just don't have the capacity (the ones I've found), and they're pretty heavy. Instead I use Jensen mesh backpacks that I found at Sports Authority. I reasoned that the ultralight silnylon drybags I use were already weatherproof and combined is a much lighter weight alternative. The only issues I had were how to hang them on my rack, and possibly the zipper( I think that was my fault for over-stuffing the pack.) If there's enough interest I'll post a separate thread about it later.
Carried in the rack trunk are: misc. spare parts, the rest of my tools, some wire to use as "helping-hands" if I need to work on my chain, Chain lube, needle and thread, first aid, bungees.
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