With airlines like Ryanair, EasyJet and Wizz Air having strict baggage allowance, having a bag that fits the exact carry-on dimensions is the only way to avoid expensive last-minute fees at the boarding gate.

This Lynxcher Backpack from Amazon could be the ideal travel companion for anyone looking to breeze through airport security, and without having to pay an extra penny.

It's sized at 40x20x25cm and complies with the latest hand luggage allowance rules for Ryanair which is included for free with every ticket.

Plus, you can also make a saving on the rucksack, which currently has a 15% discount ahead of the holiday season.

It's available in a number of colours, but the black option is the best value, with a price mark of €26.33.

The bag is compact enough to fit under the seat on the likes of Ryanair and EasyJet and is spacious on the inside when compared to traditional 'sport' backpacks.

It has a soft-sided design to easily fit in the metal sizers at the airport, while the bag opens like a suitcase making it easy to pack outfits and other belongings.

It's design also features a number of compartments, including an anti-theft pocket for your phone and passport, laptop compartment, two side pockets, and a waterproof layer so everything can be neatly separated.

More than 900 shoppers have tried and tested the rucksack, giving it an average rating of 4.6 stars on Amazon.

One customer said in their five-star review: "Brilliant rucksack with so many different compartments to keep all of your belongings organised. The bag is sturdy and the waterproof pocket is handy to protect your clothes from accidental leaks.

"The security pocket is also brilliant, allowing you to store your phone, wallet and/or important documents safely between the bag itself and your back."

Another wrote: "Works great packed for a 3 day trip and fit in the carry on no problems. And on your back easy transportation through airport, the compression straps double as a coat holder for easy access."

While a third said: "Perfect size for EasyJet and because it's square it takes much more than a conventional rucksack.

"When full it is quite heavy though, so perhaps too good for some our less strong flying friends but it's not a requirement to fill it! Lots of useful pockets."

To shop the Lynxcher Backpack head to Amazon here.