Pros
After a few years working there through school (with tuition assistance), you will gain enough seniority that your hourly pay is acceptable & the benefits are wonderful (my doctor & dentist have both commented as much). As it is a part time position, this does not prevent you from staying employed at UPS while having a 2nd or 3rd position elsewhere.
Cons
The starting pay is less than to be desired, less than a living wage (8.50/hr). There are regular raises however. Opportunities for advancement as a PT Package Handler are nearly none... As UPS is Union, all advancement is based on seniority. 8 or 9 years may be enough in order to go from a 3-hour job to a 6-hour job, but the minimum for getting a full-time (8-hour) position is 13 years! It is similarly difficult to advance within the management tracks from a PT supervisor, however, the opportunities and skills acquired over even a brief tenure as a PT supervisor are invaluable when seeking full-time employment elsewhere.