One product, two different weights

[oolaf]

I have one product, petfood for example. Now I had one product for one weight, but I want to change this so you can pick the size of the bag when clicking details of the product.

Now I had:
PRODUCT X 2kg
PRODUCT X 3kg
PRODUCT X 15kg

What I want is to have only one product, but how will VM know how heavy it is? Is this even possible?

[PRO]

if you have to have the weight changed. You have to use child products