I use the Lezyne caddy sack – little man bag (as the wife calls it) its like a small purse but I fit in a tiny one23 tool, 2 tubes, levers, 2 co2 and a co2 head. All in my middle jersey pocket.
Another alternative is a Rapha bag – rolled and placed under seat with a leather toe clip strap – google it.
I use a small Rapha bag to put my phone in and a set of spare boxers in to wear at work – fold it and that goes in another jersey pocket.
Saddle bags are ugly – end of.