You've made the empty grocery containers unique, so you can only have one at a time in your inventory. If I have ten stacks of meat I want to turn into grocery bundles, this means I have to interact with the vendor, purchase the empty container, then CLOSE the vendor (because if I click on the container while the vendor window is open it just sells the container back to the vendor!)
Closing the vendor window then closes my inventory window so I have to re-open my bags, then click on the empty container to bundle the groceries. Then interact with the vendor again to start the process from scratch! Also, to what end do you charge 1g35s only to then reward 1g95s when the bundle is turned in?? Not to scoff at a minor profit margin, but it seems superfluous.
Then of course there is the fact that you cannot turn in a lump group of grocery bundles at once. All of these poorly planned little things contribute to a really frustrating game element. Please rethink and revise! <3