Idea to fully working prototype? Specialised Design Companies vs Manufacturers Directly???

Hey folks! Like every entrepreneur on the planet, I have a design concept I would like to prototype or potentially put into full production. The concept is a design variation of a specialised sports bag offering a better user experience and more functionality. I knew this was going to be an expensive process, even although no prior experience in this area. These things surely need a lot of careful care, attention, planning, and a lot of trials and errors. Going through a specialised design...

Idea to fully working prototype? Specialised Design Companies vs Manufacturers Directly???

from Idea to fully working prototype? Specialised Design Companies vs Manufacturers Directly???