What is Frontier Airlines' free personal item size?

Frontier's free personal item must not exceed 18 x 14 x 8 inches. All reviewed 30L+ travel backpacks exceed this. You need a carry-on upgrade to bring a full travel backpack on board.

How much does Frontier charge for a carry-on?

Frontier carry-on fees vary by route, typically $30-60 online. The WORKS bundle includes a carry-on and checked bag. Always add baggage at booking rather than at the airport.

How strict is Frontier Airlines with carry-on sizes?

Frontier has introduced stricter enforcement in recent years. Gate agents may check bags and charge fees for non-compliant items. The carry-on limit is 24 x 16 x 10 inches.

Can I use the Osprey Farpoint 40 as a Frontier Airlines carry-on?

Yes with a paid carry-on upgrade. The Farpoint fits within Frontier's 24 x 16 x 10 inch carry-on limit. It will not pass as a free personal item.

What is the best backpack for Frontier Airlines?

The Osprey Farpoint 40 or Fairview 40 are the best value options. Both fit within Frontier's carry-on limit with room to spare.

Updated July 2026 · 10 min read

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

Photo by Hieu on Unsplash

Frontier 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 July 2026 · 10-minute read · Affiliate disclosure below

Quick Answer

Our pick: The Cotopaxi Allpa 35L ($230) is the safest choice for Frontier. At 21.3″ × 13″ × 8.3″, it exceeds Frontier’s free personal item limit (18″ × 14″ × 8″) in length and depth, though its width fits comfortably. The smaller 35L capacity keeps it visually compliant enough to avoid most gate checks.

Budget option: Any quality 30L backpack that fits within 18″ × 14″ × 8″ is the guaranteed way to avoid Frontier’s $99 gate fee.

Skip 40L bags: The Osprey Farpoint 40 and similar 40L packs are too large for Frontier’s strict enforcement. Gate fees ($99) make them impractical.

Frontier’s Carry-On Policy

Personal item limit: 18″ × 14″ × 8″ (FREE on all fares)
Full carry-on: 24″ × 16″ × 10″ (costs $59-$99 extra)
Enforcement: VERY STRICT – gate agents actively measure bags
Gate fees: $99 if your bag doesn’t fit the personal item sizer

Reality check: Frontier generates revenue from baggage fees. Gate agents use metal sizing frames and enforce limits strictly. Budget for fees or pack smaller.

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

Our Top Picks

Best for Frontier

Cotopaxi Allpa 35L

Price: $230

Capacity: 35L

Dimensions: 21.3″ × 13″ × 8.3″

The Allpa 35L is the largest backpack we recommend for Frontier. At 21.3″ × 13″ × 8.3″, it technically exceeds the personal item limit (18″ × 14″ × 8″) in length and depth, but the smaller 35L capacity and soft-sided construction mean it often passes 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 a separate shoe compartment. Works better for Frontier than 40L bags. Cotopaxi is also a certified B-Corporation.

Read Review Cotopaxi Allpa 35L on Amazon

Osprey Farpoint 40 (NOT RECOMMENDED for Frontier)

Price: $199

Capacity: 40L

Dimensions: 21.7″ × 13.8″ × 9.1″

Frontier risk: HIGH – will likely incur $99 gate fee

The Farpoint 40 is an excellent backpack for most airlines, but Frontier is different. At 21.7″ × 13.8″ × 9.1″, it exceeds Frontier’s personal item limit in length and depth, though its width just fits. Gate agents enforce this strictly. You’ll pay $99 at the gate or need to buy carry-on privileges in advance ($59-$99).

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

Read Full Review Osprey Farpoint 40 on Amazon

Osprey Fairview 40 (NOT RECOMMENDED for Frontier)

Osprey Fairview 40 women's travel backpack

Price: $200

Capacity: 40L

Dimensions: 21.3″ × 13.8″ × 9.1″

Frontier risk: HIGH – will likely incur $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 Frontier’s personal item dimensions. Save this for other carriers.

Read Review Osprey Fairview 40 on Amazon

Tortuga Travel Backpack Pro (NOT RECOMMENDED for Frontier)

Price: $350

Capacity: 40L

Dimensions: 22″ × 14.2″ × 9.1″

Frontier risk: VERY HIGH – guaranteed $99 gate fee

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

Read Review Tortuga Travel Backpack Pro 40L on Amazon

Comparison Table

Backpack	Price	Capacity	Dimensions	Fits Frontier	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

Good news: Frontier has one of the most generous carry-on size limits among US budget carriers. Every backpack in our lineup fits within their 24 x 16 x 10 inch limit, and the Peak Design 45L fits when compressed to 35L.

What to Expect at Frontier Gates

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

Every Flight

Gate agents use metal sizing frames. If your bag doesn’t fit, you pay $99 on the spot. No exceptions, no negotiations.

Best Strategy

Pack a small bag (30-35L max), or buy carry-on privileges when booking ($59 vs $99 at gate). Don’t gamble.

Common Questions

Can I bring a 40L backpack on Frontier?

Not without paying $99 at the gate or buying carry-on privileges in advance ($59-$99). Frontier’s personal item limit is 18″ × 14″ × 8″. Most 40L backpacks exceed this in all three dimensions.

Does Frontier actually measure bags?

Yes, every flight. Frontier gate agents use metal sizing frames and enforce limits strictly. This is part of their revenue model. Budget for the fee or pack smaller.

What happens if my bag doesn’t fit?

You pay $99 at the gate to check it. Credit card only. No exceptions. This is more expensive than buying carry-on privileges when booking ($59 online).

Is the Cotopaxi Allpa 35L guaranteed to work?

No backpack is guaranteed with Frontier 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.

Related Airline Guides

Last updated: July 2026. Always verify current limits at flyfrontier.com before travel, as policies can change.

Affiliate disclosure: Some links on this page are affiliate links. If you buy through them, we may earn a small commission at no extra cost to you. We only recommend products we’ve researched thoroughly. Read our full disclosure policy.