lumiere & co. falcon is the best for the things you look for.
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I found the topeak elementa xs perfect. I pack a topeak nano multitool, two tpu’s, two co2 canisters, tyre levers and a small chainbreaker in it ans it’s still small. You can get it really small with just one co2 and tpu. It also has loops onder the bag for co2 or pump.
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I have a small pouch that I carry with me in the middle jersey pocket. It’s flat enough where it will not make a difference if i crash. Inside I have tire levers, 2xCO2 cartridges with one removable nozzle, a multi-tool with chain breaker, spare chain link and tire plug tool.
I switch between a gravel and road bike throughout the week so the bikes only have the appropriate spare tube under the seat. The pouch allows me to make a bike switch to be a seamless move without having to remember to switch things when I’m switching the bikes.
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Here are some small lightweight saddle bags, with option also
for custom-made by specs: Saddle Bag LZ – totsicycling.com
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Have tested this thoroughly now. £3 for the smallest lightest saddle bag I’ve used 
It’s great. Easy access. Secure. Not for the wettest of wet days because of how it opens, but it is a combination of tpu and neoprene.
ultimate saddle bag geekery comes from Tobias of Rides of Japan:
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What have you managed to fit in it?
It’s stretchy, but I’ve got a daysaver essential 8 and coworking 5, co2 cannister, co2 head, tpu tube, dynaplug and a sram battery. Could probably get a couple of other small bits in there.
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Great, thank you! Looks pretty good, I’ll give one a try.