These huge storage boxes look like they would severely mess with balance. I can already feel the difference in maneuverability when I put a grocery bag in front of a bike, now imagine 30kg of mail in there.
This bike (the small one) is even designed for double that amount (60kg). As common as non-motorized post bikes are already, I guess you learn to deal with it.
They're sturdy containers along the center of the bike. I'm sure it feels a little different, but nothing too disconcerting. Besides, once they've reached their destination area, they're stopping every 20 meters to deliver mail to a different building.
I have an electric bike with front and rear racks plus rear side baskets. With them all loaded up the bike handles much differently but isn't hard to control. You get used to it quickly.
Notice that the handlebars are tilted while they front basket is straight. They're not attached to the forks, they're attached to the frame. While that's still a lot of weight (and heaven help you if it shifts during a turn) it's not going to have the same feeling as a basket which is attached to the bars.
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