I am a product designer with more then 6 years on design luggage and bags big company like Sony, Ford, Cadillac, and Jeep etc. in Hong Kong, so I am fully understand about the manufacturing on cut and sew and construction on different luggage.
Also with my knowledge background in this industry, I would avoid all the unworkable concept at the beginning, that will save you lots of time and money at the end.
I would also prepare a full tech spec pack like a document with dimension and material recommendation for you to work with factory.
Regarding to my network, I could also help your team to propose China factory for sampling.
The project will divided into 2 parts and I will request 2 milestone.
1st milestone USD 750- which include design drawing with at least 3 design concepts on each item and 3-4 times modification.
2nd milestone USD500- which include a full document with material recommendation and dimension/color for you to work with factory.
so if you think the 1st stage is good enough for you, you could stop and no need to pay the 2nd milestone.
So please feel free to contract me for any question about this project and look forward to work with you.
Have a nice day