The price is based on 2 standards: the price for the making + the price of 2m of fabric (1m body/1m lining).
Fixed rates for the making are (incl. zipper and hardware details):
-160 euro for the 50 ways classic or M
-180 euro for the 50 ways cross
-180 euro for the 50 ways classic or M with leather handles
-200 euro for the 50 ways cross with leather handles
Variable rates for the fabrics are:
-from 20 euro/m up to 50 euro/m for body fabrics
-from 15 euro/m up to 35 euro/m for lining fabrics
Hard to express in time, but easy to say I can't make it in one breath. Main steps are: cutting and overlocking the fabrics. making the handles, making the zip pocket, assembling.
It's a matter of concentration. There are so many actions involved. Every bag is different in it's details and even for one bag I always change thread colour and needles through different steps. The assemblance is challenging because of the thickness of the layers.