Maybe this bag is an option...
This listing is for a big tote bag made of faux suede in mint (bottom) and cotton patchwork in grey/yellow/pink.
The lining is made of black cotton.
I used white thread for seams.
approx. 13"x6" / 34x15cm
hight: approx. 14" / 36cm
Straps: approx.27.5" / 70cm
or in other words: enough space for three big folders:)