u/Groovy_Pillow_1001

Hi! I'm going on an interrail trip through Europe for 3-4 weeks this summer. As this will be my first time travelling out of a backpack i need to buy one - question is what size and brand is best ? Seeing as I plan on travelling a whole lot more, i would like a size that's versatile. For the size I was thinking about 50 L, and for the brand Osprey (though they are quite pricey, i would like to stay under 150-200€ grand max). Does anyone have any tips, or bags that worked for them ?

thanks!