Carry-on baggage rules at Lufthansa

What the official page says

Economy Class and Premium Economy Class: 1 piece of carry-on baggage (55 x 40 x 23 cm and up to 8 kg). Folding garment bag (57 x 54 x 15 cm). First Class and Business Class: 2 pieces of carry-on baggage (55 x 40 x 23 cm and up to 8 kg each). You can still take your handbag, a laptop bag or a small rucksack (max. 40 x 30 x 10 cm) into the cabin.