The size of the products (Length x Width), if your bag's have the gusset, also please provide the gusset size.
Thickness in micron or Mil.
The material: HDPE/LDPE/Biodegradable.
The printing: How many colors printing in 1 side or 2 sides?
It will be very useful if you can provide your bag's picture. Of course, samples will be best.