The characteristic of being bulky, or of having bulk.(noun)
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Use "bulkiness" in a sentence
""The results also confirmed Australia's pet gripes about strollers - namely their bulkiness, difficulties unfolding the stroller and lack of storage compartments.""
"In other words, many of the patterns covered have that Western 'bulkiness' which stems from use in waters that tend to be 'heavier' while still retaining a certain 'delicacy' consistent with older, traditional styling combined with a certain allusion to realism."
"Sleek and stylish in design, the "bulkiness" of the older Palm Treo's is finally gone, as is any sign of ye olde antenna stub, while coming with the latest Windows Mobile 6.1."