I have started researching and am considering starting a small UK business producing a strong, waterproof and high quality soft luggage system. I am in the early stages of design and development and have a number of various materials and design options. The bags design would be fairly simple but with features revolving around the overland market. From the list of options I have below it would be good to get feedback as to what end users may require and I will try to incorporate all reasonable features into the design. Please help me along with your views but remember I will be a small producer. I have listed various features I hope to incorporate into the bags - If you can let me know what you feel is the important stuff by choosing any of the features I have listed in order they appeal to you. Also mention anything you think is not worth the bother -Then add any further comments you feel relevant.

A) roll top, 30 + litre capacity, carry handles
B) Full supporting webbing straps around the complete bag (ie not just stitched onto an anchor point)
C) Cordura exterior material with pvc internal membrane.
D) at extra cost fireproof,waterproof,kevlar anti slash cordura type material military grade stuff (this is expensive material made in UK) but can be an option available)
E) stainless steel fittings and buckles
or
F) plastic fittings and buckles
G) Panniers lockable at buckles and wire loops integrated to facilitate locking bags to bike.
H) Separate support harness to fit to bike
I) two exterior pockets for bottles and a mesh front pocket for stuffing bits and pieces in.
J) Attachments for separate small under-slung removable bag (for tools or waterproofs etc.
H) bags longer and not so deep ie suitcase shape
or
I) more box (standard) pannier shape.
J) extra internal pockets - to keep papers etc seperate or external waterproof pocket (if design allows)
K)some degree of custom design service -ie extra pockets fixing points straps etc etc.(at a cost)
J) What do you feel a reasonable cost would be for this type of Pannier system... be realistic
I am trying to see if this is a viable and profitable business and would hope to be producing market ready panniers early next spring.
Thanks for any feedback
Jake.