I found the small Svord gent’s peasant knife an excellent folder for my PSK. It is a non locking 1 7/8” blade (+ve for UK legal stuff) but with a straight razor like tang so the blade won’t fold back under use like an SAK.
Its handle/knife is very flat so perfect for tight packing:
Total 10.5cm long (of which the thin tang is about 2.5cm)
2cm at its widest & 5mm thick for the body.
It’s spent most of its time waiting patiently in my PSK but faired very well box and tape cutting during a house move. No hard use feedback!
The blade body has a convex profile but a decent flat bevel on the edge makes for easy sharpening, also the knife is listed as carbon steel but I am pretty sure it’s an ok stainless grade.
www.svord.comThe larger locking SL looks like it would pack in a kit very well also.
Dougb