On Spirit Airlines, a fanny pack (waist bag) technically counts as a personal item if you are wearing it as your only bag, but it is often a "grey area" depending on the gate agent's discretion. Spirit’s strict policy allows for one free personal item per guest, which must fit entirely within the sizer dimensions of 18 x 14 x 8 inches. If you are already carrying a small backpack or a purse as your one free item, a gate agent may require you to "consolidate" by placing the fanny pack inside your other bag before boarding. However, Spirit does allow certain "extra" items for free, such as an umbrella, a wrap, or a camera. To avoid a potential $100 gate-check fee in 2026, the safest strategy is to ensure your fanny pack is small enough to be tucked inside your main personal item bag if asked. Many travelers "wear" the fanny pack under a jacket or oversized sweater during boarding to keep it discreet, as Spirit is famously vigilant about enforcing their "one bag" limit to maximize ancillary revenue.