As each furniture design is totally different, it depends. You can easily check the maximal load bearing capacity for your specific shelf (and each compartment, too) in the desktop version of the configurator here.
Shelves
How much weight can a shelf hold?
Other topics
Can I order extra shelf elements?
Do you offer corner cabinets?
How do I measure my space for Tylko shelves?
I don't want to order a whole shelf. Can I just order indivdual pieces?
How much weight can each drawer hold?
Can I hang my Tylko shelf on a wall?
Do your Sideboards have any feet on the bottom?
Can I use my Tylko shelf as a room divider?
What is the maximal height my shelf can be and still be stood up under the ceiling?
What is the usable area of each depth's compartments?
Do I have to fix my shelf to the wall?
What is the leg or plinth height for Sideboards?