Minimum weight for shipping

With this extension, you can subject individual products to a minimum weight. 

Let's say you sell books and socks. The books don't matter, but you only send the socks if they weigh 5 kilos or more, regardless of the category. 

1. in a central place, let's say under “Minimum values” in the admin, we enter a value for the minimum weight we need.
2. for each product we set a field “Minimum weight shipping” yes/no - default is no
3. in the shopping cart we check whether products with “yes” are in the shopping cart and if so, we add up their weight and see if it is higher than the configuration value.
4. if no, we show an error message of your choice such as “2 kilos are still missing to enable shipping!”

Now you can subject the socks to a minimum weight, but continue to send the books as normal.