The phrase "bulky objects" refers to things that are big, heavy, or take up a lot of space. They are usually difficult to move or transport because of their size.
Sentences with «bulky objects»
To carry bulky objects, the front passenger seat folds flat. (kbb.com)
However, the boot opening is quite small, so loading bulky objects can prove tricky. (carbuyer.co.uk)
A power tailgate is standard to make loading less difficult and the wide opening makes it easy to manage bulky objects. (bestride.com)