The psychological effect of a even a small nuke adds to the actual damage from the implosion and radiation.
Also, a lot of the weight on a nuke is shielding. If that's removed, it really does fit in a suitcase.
The weight of the hiroshima bomb was approximately 9,000 lbs., most of that casing, "shotgun" assembly, instrumentation and shielding. The weight of the uranium was 200 lbs.
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