Packing a personal item for Frontier Airlines in 2026 requires surgical precision because their size limit remains a strict 14" x 18" x 8". To maximize this space, use a soft-sided bag or a "Frontier-specific" backpack rather than a hard-shell case, as soft bags can be squished into the sizer if slightly overpacked. Utilize the "rolling" method for clothes to save space and reduce wrinkles, and pack heavy items like shoes (wear your bulkiest pair!) at the bottom. Use compression packing cubes to suck the air out of your garments. Since you only have one bag, "nest" smaller items like chargers and socks inside your shoes. Keep your liquids and electronics in an easy-access outer pocket to avoid rummaging at security. A key 2026 tip: wear a multi-pocket jacket; you can "pack" your heavy power banks, snacks, and even a rolled-up t-shirt in your pockets, as clothes you are wearing don't count toward your baggage limit. Always test your bag in a home sizer or measure it including the handles and wheels, as Frontier gate agents are famously vigilant and will charge up to $100 if the bag doesn't slide into the metal sizer with ease.