Small Garments seamstress

A start up company needs the skills of a qualified seamstress to make pouches in an eco friendly fabric. This pouches will then be filled and closed with a ribbon and will be on sale over the web and as wholesale. The materials used will be 100% natural and eco friendly and it is therefore imperative that the job be done in the most eco friendly way possible (waste must either be disposed of properly or returned to us for disposal). Initial order will be the samples range and around 500 pieces once samples have been approved. I will then require replenishment stock for website and one off orders for wholesale clients.
I have attached a picture of the kind of pouches in question but please note the material will be different and possibly the way we attach the ribbon.
I am happy for an hourly rate to start with but after initial order, I would prefer having a cost per bag as this would make my costings much more manageable.