How to alphabetically sort values in a pandas column that is a list

I had a question about sorting values in a list in a dataframe. I have sales order data with about 3000 rows. A sales order can contain one or multiple inventory items. I reshaped my data and was able to create a dataset like this:

Current result:

I would like to sort each ‘bundle’ value alphabetically by row, so I can group the resulting string, quantify, and visualize in tableau against other data in my dataframe, but am having trouble doing so.

I tried various things like a lambda function and ‘sort’, but that ruined the data. I also tried using sort values on the bundle column, and this helped in certain ways, but did not sort the items in the list alphabetically.

is there any way to parse through each ‘bundle’ column value and sort the value alphabetically?

I did try
z = df.copy()
z = z[‘bundle’].sort_values()

this works for my sample data I provided in this question, but only because the data is oversimplified. It doesnt work on my actual data.

here is an example where the sort_values is not sorting my data:

    testdf = pd.DataFrame({'sales_order': ['so-1','so-2'],
    'Inv_item': ['Revolve 3 Clean 110cm,Resolution 3 Glare - 120bp- Normal viscosity',
    'Resolution 3 Glare - 120bp - Normal viscosity,Revolve 3 Clean 110cm']})

    testdf['Inv_item'].sort_values()

    1    Resolution 3 Glare - 120bp - Normal viscosity,...
    0    Revolve 3 Clean 110cm,Resolution 3 Glare - 120...
    Name: Inv_item, dtype: object

Thanks for reading/helping!