Re:
A few observations from using the above bags today...
If I pack the medium Fuel Pod full it has a tenancy to flop to one side slightly, which means I catch it with the inside of my knees. Once I took my phone out of it and rearranged the contents it was much better. The inside of my knees would occasionally rub on the pack when I was out of the saddle climbing up a hill, if you're a bandy legged fecker it wouldn't happen.
I think the issue was the velcro straps moving about on the smooth top tube, maybe some grip tape or a rubber band between top tube and velcro strap would help.
In the Fuel Pod today I had a spare tube, 2 CO2 canisters with inflator, 2 tyre levers, a multi tool, energy bar, energy gel, keys.
The Stem Cell bags may have to go on front of the bars, as again when I got out of the saddle on a steep climb I would catch my knees on them. The fit and security of them was spot on though. I just had a water bottle in one Stem Cell, and the other would have taken my jacket if it had ever got warm enough for me to take it off!
I don't know what the deal is with bike touring or bike-packing, are you meant to stay seated and grind the gears on climbs? It seems that either my frame is short, or my legs are long!, either way it felt a bit odd when I did find myself needing you be out of the saddle on a climb as my knees sometimes rubbed on the bags, by the end of the ride I was used to it though.