Equipment like Adventuring Gear and Bag of Books employ a "uses" mechanic that helps abstract the equipment buying process and encourages improvisation.
Adventuring Gear:
"When you rummage through your adventuring gear for some useful mundane item, you find what you need and mark off a use."
Say a player pulls a rope out of their bag and marks a use. They then use the rope. Does that rope persist and enter their inventory as a separate item if it makes sense in the fiction (i.e., if they remember to collect it).
Or is the item consumed along with the "use" and just kind of hand-waved away?
Similarly, if a character pulls out a book about Halfling anatomy to help him during a dissection, can he continue to Spout Lore at a +1 on Halfling anatomy until he somehow loses the book in the fiction?