The news reports have given only an aggregate amount, but do not say whether it was all in one bag. One and a half pounds (probably rounded off, possibly from a significantly lesser actual amount) may have been the total of five individual "stashes" of not more than about 140 g each, or could have been any number of half-done smaller baggies1.
Given the risk of buying from unknown persons in strange places, relatively larger and more regular/frequent "dosages" by those who claim a medicinal use, and the traditions of "communal sharing" associated with social use, that seems a "comfortable," but not particularly excessive, amount for a six-month tour(?) for five (or more?) people.
1 Since it's "packaged for sale" when one buys, it's my understanding that some regular users make a habit of splitting original bags into multiple bags of irregular size to provide a defense against the charge of dealing(?).