Incredibly. In my experience, they're very strict. Every time I've flown with them, they have a measuring guide and the bag has to easily fit in it - you have to slide it in with ease, you can't jam it in there. They make a LOT of money from charging people with oversized baggage...
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If you purchased the 10kg Check-In Bag (up to 10kg with maximum dimensions of 55cm x 40cm x 20cm) you may carry your small bag on board the aircraft, however the 10kg Check-In Bag must be deposited at the bag-drop desk prior to entering security.
Usually, many airlines won't check every carry-on but will instead go for ones that look oversized. If your luggage does not fit in the sizer, you might have to pay a checked bag fee along with the gate checking fee and have your bag transferred to the airplane's cargo.
So, how strict are they about check-in luggage? It depends, is the answer. Ryanair has a 10kg weight limit for check-in bags, but they are frequently willing to let passengers go over by a few kilos. If your bag is significantly overweight, they may charge you an additional fee.
If your Check-in Bag exceeds your baggage weight allowance (10kg or 20kg), you will be charged an additional excess weight fee per extra kilo at the airport. See our Table of Fees.
As long as it's within their sizes they don't care what type of bag it is. Usually, the stated dimensions include wheels if present. Yes Caz, you will be fine with a bag that has no wheels.
You'll need to pay an excess luggage charge if your luggage is heavier than your allowance when you check-in. Each airline also has a restriction on how heavy each piece of luggage can be, and some airlines will only allow one piece of hold luggage per person.
You are allowed a single personal item, like a backpack, however, your Ryanair cabin bag can't be larger than 25 cm x 40 cm x 20 cm. Customers with Priority tickets can bring one personal item and one piece of carry-on luggage that doesn't weigh more than 10 kilograms and isn't larger than 55 cm x 40 cm x 20 cm.
Excess/Overweight BaggageAny passenger exceeding their 44 lb/20 kg personal checked baggage allowance per bag will be charged the prevailing fee on the day of travel.
A bumbag/fanny pack is an accessory, like a backpack or a lady's purse/handbag, and you should be prepared for it to be treated as such. That said, Mrs DC8 always wears a bumbag when travelling and it has never been an issue on any airline including the likes of Ryanair and Easyjet.
Airlines calculate carry-on luggage size measurements using two methods: Height by width by depth: Most – but not all – airlines measure bags by inches or centimeters using this formula: height by width by depth, such as 22 x 14 x 9 inches.
Most airlines charge $100-$200 if your luggage is overweight. Delta and American Airlines charge $100 if your bag weighs 51-70 pounds and $200 if your bag weighs 71-100 pounds. United airlines charges up to $400 for overweight bags depending on the weight and destination.