1)please tell us your filling range(dose)
Such as 50ml, 100ml,300ml,500ml,1000ml,5000ml
2)please describe your product in detail. Is it liquid or paste ? What is the viscosity?
Does it have a good fluidity?
You can also make a example ,like water ,shower gel,shampoo ,toothpaste,detergent ,
cosmetic and so on
3) provid all of inner diameter size of your vessel mouth (bottleneck)