How can you add data from a variable into a column in a data flow?

I need to populate a table with data from a variable. The data type of the variable is String. I'm running into issues doing it the way I am. I have variable
User:VariableName = "Some moderately sized string of data"
When I try to use a Derived Column Transformation Editor to insert the variable into the data flow as a new column, SSIS forces the Data Type to be Unicode String[DT_WSTR] and I can't change it. Additionally the length is 0 and I also can't change that.
When I run the package it errors with a truncation error. If the length is 0 then that makes sense but then why can't I change it to something that makes more sense?
What is the correct way to go about this?

Use advanced editor to change data type and length.
http://www.sureshjoshi.com/development/ssis-string-variables-in-derived-columns/

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[JDeveloper 10.1.3 SU4]
[JHeadstart 10.1.3 build 78]
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