Breakdown of kono hako no ookisa ha tyoudo ii desu ne.
ですdesu
to be
はha
topic particle
のno
possessive case particle
このkono
this ... adnominal
ねne
confirmation particle
箱hako
box
いいii
good
丁度tyoudo
exactly, precisely; just
大きさookisa
size
大きさ is more general than サイズ. For shoes, clothes and other items that come in standardized sizes, it's more common to hear サイズ.
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