Final answer:
The eighteen packets of SpagBol in 'Uglies' were swapped by Tally for a sleeping bag and sweater.
Step-by-step explanation:
In the book Uglies, the eighteen packets of SpagBol were swapped by Tally for a sleeping bag and sweater. This is an important detail from the novel as it pertains to the survival and trading aspects within the dystopian world in which Tally Youngblood, the protagonist, finds herself. Such transactions illustrate the resourcefulness of characters and the value placed on essential commodities in their society.