Ryanair Carry-On Rules — What Actually Fits (and What You'll Pay For)
Will a 35L Backpack Fit on Ryanair?
Ryanair enforces a strict 55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in) carry-on limit, and a 35L backpack will typically exceed the 20 cm (7.9 in) depth — expect to check this bag.
Without priority boarding, only a small personal item (40 × 20 × 30 cm (15.7 × 7.9 × 11.8 in)) is included free. A 35L bag will almost certainly exceed that limit.
Placement: Likely Does Not Fit
Confidence: Low
Best For: 3–5 Day Trips
Last updated: March 2026
A 35L backpack fits within Ryanair's carry-on limit of 55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in). However, Ryanair only includes a small personal item (40 × 20 × 30 cm (15.7 × 7.9 × 11.8 in)) for free on standard fares. To bring a 35L bag on board, you need to purchase priority boarding — which also gives you overhead bin access. Without it, your bag may be gate-checked and charged. Pre-purchasing priority online is significantly cheaper than paying at the gate. Carry-on allowances vary by ticket type — stricter size limits are commonly enforced.
Check if this will actually fit your trip →
Gear
Bags That Work on Ryanair at 35L
Based on Ryanair’s 21.7 × 15.7 × 7.9 in carry-on limit and real bag dimensions.
Safe Pick
Peak Design Travel Backpack 30L
30L with extra organization. Slim enough for any Ryanair overhead bin.
Check price →
Rolling alternative — Borderline
Travelpro Maxlite 5 International Spinner
39L rolling carry-on at 21.75 × 15.75 × 7.75 in. The only roller close to Ryanair's depth limit — clears the 7.9" depth, but exceeds height and width by ~1 mm each. Rigid frame means no compression margin. May pass a lenient sizer check, but not guaranteed on strict enforcement days.
Check price →
Packing optimization
Compression Packing Cubes
On strict airlines like Ryanair, packed depth is what causes sizer failures — not bag size alone. Compression cubes reduce clothing volume by 20–30%, and soft bags compress better than rigid ones. If you're close to the limit, organized compression is the difference between boarding and gate-checking.
Check price →
We may earn a commission from purchases — disclosure
Stay Carry-On Only
This setup exceeds typical carry-on capacity. Add a personal item or check a bag.
Gear
Recommended Bags for This Trip
These recommendations are based on real bag dimensions compared to Ryanair carry-on limits, plus how well each bag fits a 35-liter packing load.
Packing Reality Check
When Does a 35L Bag Work Well on Ryanair?
Works Well
- Priority Boarding with deliberate underpacking (15–20% empty)
- 5–7 day trips using compression cubes and laundry access
- Soft-sided bags specifically designed for Ryanair's dimensions
- Travelers experienced with the sizer box who measure before flying
Becomes a Tight Fit
- Packed to full 35L capacity — depth exceeds 20 cm (7.9 in) on most bags
- Without Priority Boarding — guaranteed gate fee
- Any trip with bulky layers, shoes, or a full tech kit
- First-time Ryanair travelers who haven't tested the sizer at home
Ryanair Bag Policy
Ryanair Carry-On Size Limits
| Personal item (free) |
40 × 20 × 30 cm (15.7 × 7.9 × 11.8 in) — must fit under the seat |
| Carry-on (priority only) |
55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in) — requires paid priority boarding |
| Weight limit |
10 kg for carry-on; no stated weight limit for personal item |
| Enforcement |
Strict — bags are measured at the gate; oversized items may be charged |
| Fit at 35L |
A 35L backpack typically works as a cabin bag with priority boarding — too large for the free personal item slot |
For a full breakdown of size limits, boarding rules, and exceptions, see our airline carry-on rules guide →
Bottom Line
- A 35L bag's fit on Ryanair is decided at the sizer box, not on the spec sheet — soft-sided builds pass, structured ones do not
- Without priority, only a small personal item (40 × 20 × 30 cm (15.7 × 7.9 × 11.8 in)) flies free
- Pre-purchase priority online — it is significantly cheaper than paying at the gate
- Ryanair enforces bag limits strictly and consistently at boarding
Airline enforcement
How Strict Is Ryanair With Carry-On Bags?
Ryanair is one of the strictest airlines in the world for carry-on enforcement. Every passenger must place their bag in a physical sizer box at the gate — if it doesn't fit, you pay a fee and it goes in the hold. The free allowance is one small personal bag (40 × 20 × 25 cm (15.7 × 7.9 × 9.8 in)) that fits under the seat. Anything larger — including most backpacks over 20L — requires Priority Boarding (from ~€6–8), which allows a 55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in) cabin bag in the overhead bin. The 20 cm (7.9 in) depth limit is the binding constraint. Most backpacks exceed 20 cm (7.9 in) when packed, even if height and width are within range. Ryanair charges €/£30–50 at the gate for non-compliant bags — more than the Priority Boarding upgrade costs. Weight is enforced: 10 kg for cabin bags. Gate agents use handheld scales. There is no soft enforcement here. Ryanair staff are trained to catch oversized bags and the airline profits from gate fees. If you're flying Ryanair, buy Priority Boarding and measure your bag before you leave home.
Size insight
35L Backpack on Ryanair: What Actually Changes?
A 35L backpack is the practical carry-on ceiling on Ryanair. It requires Priority Boarding and must fit the 55 × 40 × 20 cm (21.7 × 15.7 × 7.9 in) sizer. At 35L, most travel packs exceed 20 cm (7.9 in) depth when fully packed. The bag must be underpacked or heavily compressed to clear. Ryanair's sizer box enforcement is not flexible — if the bag doesn't slide in smoothly, it's flagged. Travelers who make 35L work on Ryanair typically use compression cubes and leave 15–20% of the bag empty. Beyond 5 days, you'll need laundry access to stay within this constraint.
Notes
How Accurate Is This?
Ryanair's free cabin item is 40×20×25 cm (under-seat); paid priority boarding adds a 55×40×20 cm (21.7 × 15.7 × 7.9 in) carry-on to the overhead bin. The dimensions translate roughly to 16×8×10 inches (free) and 22×16×8 inches (paid). Enforcement is extremely strict—sizers are deployed at every gate, and oversized bags incur €20–€50 fees on the spot.
A 30L or 40L backpack will not fit Ryanair's free allowance and requires purchase of priority boarding (typically €4–€15 upfront). Without priority, your larger bag must be checked, which carries additional fees. Ryanair's low fares come with tight packing expectations and strict dimensional compliance.
Unlike US carriers, Ryanair does not negotiate bag size at the gate. If your bag sizes exceed the sizer slot, you pay the fee or gate-check immediately. Weight limits are not enforced, but dimensions are absolute.
This is a planning tool to estimate capacity; actual gate acceptance depends on strict dimensional compliance and priority boarding purchase. For larger backpacks, factor priority boarding cost into your Ryanair fare calculation.
