Hi,
My problem is similar:
I would like to block package weights of more than 4.41lb/2kg. I've put a comment in under Shipping Costs to advise customers that they should contact me if the total weight of their products exceeds this, so that I can advise the most economical way of sending the order.
The reason for this is that I might split the order into more than one package or I might send the order by courier. Above 2kg, I'm looking at parcel weights with the Irish postal services which are a lot more expensive.
Instead of "blocking" larger weights, Zen Cart just creates new shipping costs. Is it assuming I want to send the order in 2 packages?
How can I set it up so Zen Cart won't accept orders heavier than 2kg or prompts customers to contact me?