Travel Luggage in Prague

Most of the luggage sold in Europe meets European airline regulations, as you will see if you google “luggage 50 x 40 x 20” for many options including Amazon.

Do you have a TJ Maxx near you? They do have sometimes have luggage that fits the international low cost carrier dimensions. I'd go by every time you are in that area and take a tape measure with you! You'll also want to know how much it weighs as some will weigh and measure. Most of the TJ Maxx bags are wheeled bags so if she can go with a backpack type it will be lighter.

Also check www.ebags.com I just clicked on it and got a coupon code so I'd also recommend you sign up for their emails as they often have deals and we are coming up to the "deal" time of the year, lol!!

My DD studied abroad in Prague last spring and took a small collapsible duffel (like a gym bag) that she used for her weekend trips. The kids pack pretty light and in general don't use a lot of clothes because everything has to be dried on a rack. Your daughter will have a great time, Prague is superbly located for travel within Europe. Tip: make sure she brings her own towels to Prague even though they are take up a lot of room in the suitcase. The girls who planned to buy cheap towels once they arrived quickly found that there is no Bed Bath & Beyond and the available towels were skimpy and thin.

A light weight duffle bag like the REI Stuff Travel 30L Duffle is a good weekender that will fit the Ryan Air if it is not stuffed. Benefit is that it is light making it easier to meet Ryan's weight limit.
https://www.rei.com/product/137644/rei-co-op-stuff-travel-duffel-30l
Frame Material None
Dimensions 20 x 8.5 x 8.5 inches (51 x 20 x 20 cm)
Packable Yes
Weight 6.4 ounces
Carry the duffel by its nylon luggage handle or included detachable shoulder strap

A better alterantive to a 30L duffle would be a larger 40L duffle if your daughter doesn't stuff the bag to maximum capacity. The advantage is she could use it as an extra checked bag to bring goodies back from her travels.
https://www.rei.com/product/124504/rei-co-op-roadtripper-duffel-40l
"With a new shape that’s easier to fit into an overhead bin or your car’s trunk, the 40L REI Co-op Roadtripper duffel is roomy, easy to carry and packs down into its own side pocket."

Frame Material None
Dimensions 21 x 10 x 10 inches (53 x 25.3 x25.4 cm)
Packable Yes
Weight 1 lb. 2 oz.

You can find the 21" suitcases at Costco, TJ Maxx, Macy's, and I like this line of luggage (available at Costco too) - www.delsey.com. I like the idea of a collapsible duffle too. We bought one of the stuffable REI duffles and actually used it as a large backpack cover & stuffed our large backpack into it to protect the buckles and straps. We stuff extra items in it as it had lots of room. Most of the students use a backpack or duffle to travel on the weekends.

Oftentimes, students just head to the airport on Friday after class with passport & bag and see what flights are offered at a last-minute discount & have a fun weekend of cheap travel! My son is going this semester too! Keep in mind extra suitcases may cost more on flight home if you are boarding a foreign carrier (i.e. I flew Delta in & got 2 bags covered on way over to CZ but flew KLM/Air France on way out & had to pay baggage free for 2nd suitcase).

There are nice towels at Tesco for about $3-5 and when I go, I just go buy toiletries and towel at Tesco. I've found them quite nice & with a handy, hang hook on the end. In addition, tell her to buy or pack a reusable grocery sack to use when she grocery shops as you have to either bring your own bag or purchase one at the store. They are available at check-outs at larger CZ groceries or mini-marts cheaply for the usual plastic grocery ones or a few dollars for nice, sturdier ones. I grabbed a couple of the nicer ones at Tesco for souvenirs to use when back home in the US. IKEA has nice cheap ones to use too (buy in US @ IKEA or there is an IKEA in Prague) that fold up really small.

Hope she has a great semester! Which university in Prague (see my private message)?