Allpa 50L Adventure Travel Pack

I think unless you can really streamline your packing, you're going to have a hard time with this. You're kind of asking for a sports car and a pickup in one, which isn't impossible, but it's challenging. So here's the quick advice, often referred to as a 1.5 bag. Find the biggest bag you're comfort

Looking at the Cotopaxi Allpa 50L looks great but expensive at €260+ for a bag! I do like the removable top part that turns into a day bag thus allowing the bottom part to be carried onto a flight as hand luggage. Anyone any experience with this model?

No, it's only useful in my opinion if you need to backpack it for a short time. The smallest size is carry on compliant but the weight alone eats into your allowed kg. Especially if you're using budgets like Jetstar that only give you 7kg. I buy top up if I'm using the 32L option. I've always used a