Shipping in the UK - how to make small, medium and large packages

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I'm just setting up a multiseller site for products that vary from tiny to large but are mostly quite light.

I'm in the UK and when I set up shipping rates I only have options for weight.

Lower down in the settings I have options to set package sizes.


Royal Mail price postage by weight first then size. 

Is there a way I can do this? Or will I have to ask sellers with large light objects to describe them in the product options as being heavy so they get into the right size box?

I'm so confused!