The best solution would be the addition of a "junk bag,"
You can already do that. Place items you want to sell in a basket/crate, and then sell the container all at once for the value of the contents.
Is there then a way to buyback the container at sell price? Otherwise you'd have to get more and more containers each time, which can weigh quite a bit (especially for a mage).
Unless there's some cheap and easy way to craft containers which I'm not aware of.
