PSA - Mr. Porter has a 2 pack of Pantharella cashmere 70% off for $45: TWO PAIRS OF RIBBED CASHMERE-BLEND SOCKS
Also, not really a satchel-type, but if I did it would definitely be this one from Rider:
Saw that. But (unlike many other SF'ers) I don't use red socks. Great price if they were both navy.