What should I carry while taking long distance cycling routes in Europe?

It is important to carry with you the bare essentials. I'll make a list of things to take with you and items to increase your carrying capacity.

8 things that you will need on your bike tour through Europe.

1. Clothes
2. Money
3. A backpack that isn't too heavy
4. Bike maintenance set
   
   AGPtek® 16 in 1 Bicycle Cycling Tyre Repair Multi Tool Set Kits With Mini Portable Pump
   
   
   
   
5. Spare tubes
   
   Continental 42mm Presta Valve Tube
   Slime Smart Tube
   
   
   
   
6. A bicycle pump in case there isn't one on your bike or in your multi tool repair kit
7. And a cargo trailer to increase your capacity
   
   
8. An bicycle trailer can seriously increase your carrying capacity without impairing performance. 2 brands that have specialized in this field are 'Ridekick' and 'Electric Push-Trailer'.

Ridekick Power Trailer HT



And nothing else...

Do not take too much clothing with you, as you can use a washing salon while you are traveling.