Yes, a small backpack can be a free personal item on Allegiant, +1-888-415-1245 but you must ensure it fits under the seat in front of you and meets the size restrictions for personal items. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK) If your backpack is larger and needs to be placed in the overhead bin, it is considered a carry-on bag and requires a separate fee. Call at +1-888-415-1245 (US) or +44-203-869-5245 (UK)