It is the best in this size. I have fit clothes for a 7-day summer vacation and a 4-day winter trip!

It is in the dimensions required by airlines for underseater, so you will never have a problem even if you encounter a strange employee (especially during the return trip where you may encounter strict individuals).

In terms of space, you can easily fit many things, mainly because it has a single central compartment. The usual problem with backpacks is that they are divided. This one is like a duffel bag, but you can turn it into a backpack by taking out the straps for the back that are hidden inside the lining that touches the back.

The shoe compartment is convenient because you can put them separately without cases, bags, etc., and it is useful when traveling with a regular cabin luggage, as you don't need to put the shoes inside the suitcase and play Jenga. You simply carry them on your back in the special compartment and fill the central space with the rest, having, for example, only clothes in the cabin luggage, which gives you the flexibility to fold them as you wish.

Now, if you take it plain, it will fit a three-day trip somewhere with a warm climate. Shoes definitely won't fit together with clothes for a three-day trip, but you will somehow fit a pair of slippers.

The only negative thing is that one small side pocket (opposite the shoe pocket) is very small and also located at the bottom when you wear it as a backpack. So, you always run the risk of things falling out without noticing. Therefore, I put consumables like cotton swabs, a small shampoo, etc. in that pocket, things that won't matter if they get lost.

It is exactly what you need for flights with Ryanair or airlines that are generally strict with hand luggage. If you are not carrying anything bulky and just want to fit clothes and a small toiletry bag for a 2-3 day trip, it is perfect.

I got it for my military service, good for specific things, it doesn't have much space for bulky items, but for a simple trip with light clothes, it's great. It serves me well during my service because I was worried if it would fit everything

Very convenient and durable duffel bag that can also be used as a backpack. I bought it for a flight with Ryanair and so far I have been very satisfied with how much it can fit for three-day trips.