i have this issue in my usage scenario, may i seek your advice on how should implement this in Odoo 13. any ideas appreciated.

- this is a meat wholesaler, using odoo 13 community, inventory, purchase, sales, accounting, basic modules.

- the product is meat. packed into bags each with a weight, but not fixed.

- in stock, i want to keep track how many packs e.g. 5000 packs available.

- because each pack different weight (though similar with a few kg difference only), so when sell to customers, invoicing count on weight, 

e.g. 2 packs with weight 21.5 kg + 23.2 kg = 44.7 kg x $10 = $447.

- with this example, stock -2 packs and total products saleable, - 44.7kg.

- this business model must be kept, how should i implement in odoo 13 community.