Can I use the Outbreaker Daypack as a personal item?
Yes. The Outbreaker Daypack is designed to qualify as a personal item.
The daypack measures 17 x 11 x 6.5" (43 x 28 x 17cm) and weighs 1.1 lbs (0.5 kg). Few airlines publish specific limits for personal items and are often less strict about personal item measurements compared to carry-on items that go in the overhead bin.
You can read more about what is considered a personal item here.
Remember to review your airline's personal item guidelines before flying.