What is Spirit Airlines' free personal item size?

Spirit's free personal item must not exceed 18 x 14 x 8 inches. All reviewed 30L+ backpacks exceed this limit and require a paid carry-on upgrade.

How much does Spirit charge for a carry-on bag?

Spirit charges $37-65 online and $65-99 at the gate. The carry-on size limit is 22 x 18 x 10 inches. Always book online rather than paying at the airport.

How strict is Spirit Airlines with bag sizes?

Spirit is among the strictest US carriers. Gate agents actively measure bags and charge fees for non-compliant items.

Can I use the Osprey Farpoint 40 on Spirit Airlines?

The Farpoint fits within Spirit's carry-on limit but exceeds the free personal item limit. You will need to pay for carry-on privileges, typically $37-65 when booked online.

What is the cheapest way to bring a carry-on on Spirit?

Book your carry-on online at the time of ticket purchase. Adding it after booking costs more, and paying at the airport is the most expensive option at $65-99.

Spirit Airlines ceased all operations on May 2, 2026. The airline shut down after failing to secure a federal bailout during its second bankruptcy. All flights have been canceled and the airline is no longer operating. If you had a Spirit booking, passengers who paid by credit or debit card should receive automatic refunds. For future travel on former Spirit routes, see our guides for Frontier Airlines, JetBlue, and Southwest Airlines, which serve many of the same routes.

Updated August 2026 · 10 min read

Best Backpack for Spirit Airlines (2026): Complete Size Guide

Photo by Forsaken Films on Unsplash

Spirit Airlines is one of the strictest US budget carriers for carry-on enforcement. Only small backpacks under 35L reliably avoid fees. Here is how to choose the right one. For a complete comparison across all carriers, see the full airline size limits guide.

Updated August 2026 · 10-minute read · Affiliate disclosure below

Quick Answer

Our pick: The Cotopaxi Allpa 35L ($230) is the safest choice for Spirit’s free personal item. At 21.3″ × 13″ × 8.3″, it exceeds the limit on length and depth but the 35L capacity keeps it small enough to avoid most gate fees.

Budget option: Any quality 30L backpack that fits within 18″ × 14″ × 8″ is the guaranteed way to avoid Spirit’s fees.

Skip 40L bags: The Osprey Farpoint 40 and similar packs are too large for Spirit’s free personal item allowance. You’ll pay $65-99 at the gate or need to buy carry-on privileges ($37-65).

Spirit’s Carry-On Policy

Personal item (FREE): 18″ × 14″ × 8″ (45 × 35 × 20cm) must fit under seat
Carry-on bag (PAID): 22″ × 18″ × 10″ (56 × 46 × 25cm) costs $37-65 depending on when/how you book
Enforcement: VERY STRICT gate agents actively measure bags on full flights
Gate fees: $65-99 if your bag doesn’t fit the personal item sizer

Reality check: Spirit generates revenue from baggage fees. Gate agents use sizing frames and enforce limits strictly, especially on full flights. Budget for fees or pack smaller.

Not sure if your backpack fits? Use the free compliance checker to compare against Spirit Airlines and 20+ other airlines instantly.

Our Top Picks

Best for Spirit

Cotopaxi Allpa 35L

Price: $230

Capacity: 35L

Dimensions: 21.3″ × 13″ × 8.3″

The Allpa 35L is the largest backpack we recommend for Spirit’s free personal item. At 21.3″ × 13″ × 8.3″ against Spirit’s 18″ × 14″ × 8″ allowance, its width actually fits, but length and depth both exceed, so the smaller 35L capacity and soft-sided construction are what let it often pass gate inspection. Not guaranteed, but it’s your best shot if you need more than 30L.

Superior organization with multiple internal pockets, compression straps, and separate shoe compartment. Works better for Spirit than 40L bags. Cotopaxi is also a certified B-Corporation.

Read Review Cotopaxi Allpa 35L on Amazon

Osprey Farpoint 40 (NOT RECOMMENDED for Spirit)

Price: $199

Capacity: 40L

Dimensions: 21.7″ × 13.8″ × 9.1″

Spirit risk: HIGH will likely incur $65-99 gate fee

The Farpoint 40 is excellent for most airlines, but Spirit is different. At 21.7″ × 13.8″ × 9.1″, it exceeds Spirit’s personal item limit on length and depth. Gate agents enforce this strictly. You’ll pay $65-99 at the gate or need to buy carry-on privileges in advance ($37-65).

Use this bag for: United, Delta, American, JetBlue, Southwest, Alaska any carrier except Spirit and Frontier.

Read Full Review Osprey Farpoint 40 on Amazon

Osprey Fairview 40 (NOT RECOMMENDED for Spirit)

Osprey Fairview 40 women's travel backpack

Price: $200

Capacity: 40L

Dimensions: 21.3″ × 13.8″ × 9.1″

Spirit risk: HIGH will likely incur $65-99 gate fee

Same issue as the Farpoint: excellent bag, wrong airline. The women-specific fit doesn’t change the fact that this bag exceeds Spirit’s personal item dimensions. Save this for other carriers.

Read Review Osprey Fairview 40 on Amazon

Tortuga Travel Backpack Pro (NOT RECOMMENDED for Spirit)

Price: $350

Capacity: 40L

Dimensions: 22″ × 14.2″ × 9.1″

Spirit risk: VERY HIGH guaranteed $65-99 gate fee

Premium bag, wrong use case. The Tortuga Pro’s structured construction means it won’t compress to fit Spirit’s personal item sizer. You’ll pay $65-99 at the gate every time. Not worth it for Spirit routes.

Read Review Tortuga Travel Backpack Pro 40L on Amazon

Comparison Table

Backpack	Price	Capacity	Dimensions	Fits Spirit	Empty Weight
Osprey Farpoint 40	$199	40L	21.7 x 13.8 x 9.1 in	Yes	3.5 lbs
Osprey Fairview 40	$200	40L	21.3 x 13.8 x 9.1 in	Yes	3.5 lbs
Cotopaxi Allpa 35L	$230	35L	21.3 x 13 x 8.3 in	Yes	3.4 lbs
Nomatic 30L	$310	30L	18.9 x 13 x 8.5 in	Yes	4.0 lbs
Tortuga Pro 40L	$350	40L	22 x 14.2 x 9.1 in	Yes	4.5 lbs
Peak Design 45L	$300	30-45L	22 x 13 x 9.5 in	Yes	4.8 lbs
Osprey Daylite 26+6	$110	26-32L	16.9 x 13 x 6.3 in	Yes	1.85 lbs
Patagonia Black Hole 25L	$175	25L	18.9 x 11.8 x 5.9 in	Yes	1.4 lbs

Spirit shutdown notice: Spirit Airlines ceased operations in 2026. This guide is maintained for reference only.

What to Expect at Spirit Gates

Spirit’s business model depends on baggage fees. Expect strict enforcement:

Full Flights

Gate agents use sizing frames on full flights. If your bag doesn’t fit, you pay $65-99 on the spot. Less busy flights may be more lenient.

Best Strategy

Pack small (30-35L max), or buy carry-on privileges when booking ($37 online vs $65-99 at gate). Don’t gamble.

Common Questions

Can I bring a 40L backpack on Spirit?

Not without paying $65-99 at the gate or buying carry-on privileges in advance ($37-65). Spirit’s free personal item limit is 18″ × 14″ × 8″. Most 40L backpacks exceed this in all three dimensions.

Does Spirit actually measure bags?

Yes, especially on full flights. Spirit gate agents use sizing frames and enforce limits strictly. This is part of their revenue model. Less busy flights may be more lenient, but don’t count on it.

What happens if my bag doesn’t fit?

You pay $65-99 at the gate to check it or move it to carry-on. Credit card only. No exceptions. This is more expensive than buying carry-on privileges when booking ($37 online).

Is the Cotopaxi Allpa 35L guaranteed to work?

No backpack is guaranteed with Spirit except those that truly fit 18″ × 14″ × 8″. The Allpa 35L exceeds this but works more often than 40L bags due to its smaller capacity and soft-sided construction. It’s your best option if you need more than 30L, but be prepared to pay the fee.

Should I buy carry-on privileges in advance?

Yes, if you need a normal-sized travel backpack (35-40L). Buying online when booking costs $37-45. At the gate it’s $65-99. Much cheaper to plan ahead.

Related Airline Guides

Last updated: August 2026. Spirit Airlines ceased operations on May 2, 2026. This guide is preserved for reference.

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