On Spirit Airlines, a personal pillow is generally considered an extension of your attire or a comfort item and does not count against your baggage allowance, provided it is being carried or used. However, there is a catch: if you pack the pillow inside a bag, that bag must still meet the strict "Personal Item" dimensions (18 x 14 x 8 inches) to fly for free. If the pillow is so large that it requires its own separate tote or case, Spirit staff may attempt to classify that case as a second personal item or a carry-on, which triggers a significant fee. To ensure your pillow "flies free" without any hassle, many savvy Spirit travelers recommend wearing a travel neck pillow around their neck during boarding or using a "stuffed" pillowcase filled with clothes to save space in their primary bag, as the airline is famous for its "unbundled" pricing model where almost every extra service has a cost.