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If packaging is involved with a cosmid, then why is the insert larger than a phage?

April 26, 2017insert involved larger packaging phage

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If packaging is involved with a cosmid, then why is the insert larger than a phage?

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In a lambda replacement vector, the lysogenic genes have been deleted but the lytic genes are still present. In a cosmid (which again is basically a plasmid with cos sites), all of the phage genes have been deleted. As such, there is simply more room for the insert.