Allegiant Carry-On Size and Bag Rules (2026)

Allegiant Carry-On Luggage Size and Personal Item Limits

Allegiant permits one personal item at no extra charge, measuring up to 18 x 14 x 8 inches (45 x 35 x 20 centimeters). This piece must slide fully underneath the seat located ahead of you. A larger carry-on bag, such as a roll-aboard suitcase or garment bag, can measure up to 22 x 16 x 10 inches (55 x 40 x 25 centimeters) to fit inside the overhead bin compartment. Every measurement must include all exterior wheels, pockets, handles, and decorative elements. You can review the full policy directly on the Allegiant baggage page. For a broader overview of standard airline dimensions across the industry, read our guide to carry-on dimensions.

• Personal item size: up to 18 x 14 x 8 inches (45 x 35 x 20 centimeters)
• Carry-on size: up to 22 x 16 x 10 inches (55 x 40 x 25 centimeters)
• Measurements include all wheels, handles, pockets, and decorations
• Personal items ride under the seat; carry-ons use the overhead bin

Allegiant Bag Fees and Paid Carry-On Rules

Every Allegiant passenger receives one free personal item, but carry-on luggage requires a separate paid booking. The carry-on fee varies, so confirm the amount on Allegiant's bag-fee page. Because prices change, the airline's baggage page is where to confirm current prices for your ticket. If an under-seat piece exceeds the 18 x 14 x 8 inch threshold, Allegiant may classify the piece as a carry-on and assess the corresponding bag fee. Travelers who want to avoid paying extra baggage charges can pack everything into a single personal item. To understand how airlines distinguish these two luggage categories, check our breakdown of carry-on vs personal item rules.

• Personal items are free on every Allegiant ticket
• Carry-on luggage is an optional paid add-on
• The carry-on fee varies, so check Allegiant pricing before purchase
• Oversized personal items can trigger the standard carry-on charge

What Fits Within Allegiant Bag Sizes

An 18 x 14 x 8 inch personal item offers enough interior space for a laptop, a light sweater, charging cords, travel toiletries, and a change of clothes. Travelers using only an under-seat pack often find space for a few days of clothing if they fold garments tightly. The larger 22 x 16 x 10 inch carry-on allowance accommodates a rolling suitcase packed with several outfits, two pairs of shoes, and bulky travel accessories. If you need help fitting multiple outfits into an under-seat bag without overstuffing exterior pockets, explore our walkthrough on how to pack carry-on luggage effectively.

• Personal items hold a laptop, toiletries, and one change of clothes
• A compact pack can fit a few days of clothing when packed flat
• The 22 x 16 x 10 inch carry-on holds outfits, shoes, and layers
• Overstuffing pockets can push a bag over the official limit

Selecting Bags for Allegiant Flights

Travelers commonly evaluate models like the Aer Travel Sling 3, Peak Design 6L Sling, Aer Slim Pack, Bellroy Slim Backpack, Peak Design Everyday Backpack 20L, or Away F.A.R. Everywhere Bag for travel days. You should measure any bag fully packed against Allegiant limits before leaving home, because stuffed pockets expand exterior dimensions. Allegiant's carry-on allowance is deeper and wider than standard legacy carriers. The airline's baggage page is where to confirm weight rules, as Allegiant publishes specific guidance for cabin bags. For more details on compact backpacks, check our summary of personal item size limits.

• Measure bags after packing, including bulging side pockets and handles
• Popular packs include the Bellroy Slim Backpack and Aer Slim Pack
• The 16-inch carry-on width provides extra horizontal packing space
• Check Allegiant guidelines to confirm any cabin bag weight rules

Gate Measurements and Cabin Enforcement

Allegiant requires that every carry-on item fit completely inside the overhead bin and every personal item fit fully beneath the forward seat. Measurements include handles, wheels, and front exterior compartments. An oversized personal item may be treated as a carry-on and charged the carry-on fee. Soft-sided duffels and daypacks can compress more easily than hard-sided luggage if you avoid overpacking them. Measure your luggage from the bottom wheels to the top handle to ensure it stays within published parameters. For broader carrier standards, review our reference on airline baggage allowance rules.

• Bags must clear all dimensions including wheels, handles, and straps
• Personal items must fit entirely under the forward seat
• Bags exceeding personal item size may incur the carry-on fee
• Measure fully loaded luggage at home to prevent surprise charges

Allegiant Bag Limits Compared to Other Carriers

Allegiant's 22 x 16 x 10 inch carry-on allowance provides two extra inches of width and one extra inch of depth compared to the common 22 x 14 x 9 inch legacy carrier standard. For personal items, Allegiant's 18 x 14 x 8 inch limit matches the Frontier personal item limit, where Frontier enforces a 35-pound combined cabin weight limit and charges for carry-ons. In comparison, United sets a stricter personal item cap at 9 x 10 x 17 inches, while JetBlue permits 17 x 13 x 8 inches. Spirit Airlines ceased operations on May 2, 2026, removing its previous bag options from the market. For more carrier comparisons, see our guides on United personal item size and Frontier personal item size.

• Allegiant carry-on (22 x 16 x 10 in) is wider than the standard 22 x 14 x 9 in limit
• Allegiant personal item (18 x 14 x 8 in) equals Frontier's personal item size
• United requires a more compact 9 x 10 x 17 inch personal item
• JetBlue limits personal items to 17 x 13 x 8 inches

Frequently Asked Questions

Related Guides

Related Packing Lists

Use the interactive tool to build a packing list tailored to your trip.

Carry On Packing List 47 items · personalized Weekend Trip Packing List 46 items · personalized