I fit spare tubes plus tire-changing stuff plus other odds and ends (patches, bearings, brake pads, etc.) into tool tubes made of 4" plastic sewer pipe--far more spacious than those tractor supply tubes. These can be fit on your skid plate or inside your left pannier, depending. There are other places to mount them as well.
I'm with you on the importance of carrying certain stuff where it won't leave the bike. If it's kept in your panniers, you'll have a flat one day when you've left the panniers behind and are out for a local spin. Each bike should have it's own tube with its own supplies, so that there's no need to always be moving stuff back and forth (and forgetting to move it back and forth, with predictable consequences).
I ziptie a good mountain bike tire pump onto someplace inconspicuous on each bike as well. It's good backup for when my electric pump goes belly up right when I most need it, which has happened.
I bought one of those fender bags once. It's big enough for a single tube and a patch kit, but won't fit my tire irons or anything else. Seemed like a good idea....and maybe it is, for someone.
Hope that helps.
Mark
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