Pale and desu
Don't try to make sense of item weight by contrasting it with reality. These bugs, small enough to fit under Lona's boot, besides turning into worms when picked up, are 10 times heavier than a 15k TP headdress made out of solid gold. Mark of the Believer, the piece of equipment shown in the fifth skill slot (hotkey Q), appear to be massless as they don't increase inventory weight at all and I have no idea how that's even supposed to work especially considering it still falls to the ground when dropped.
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LonaRPG is a game, you'll have much easier time figuring out how reasonable any item's weight is based on that assumption.