Equipment like Adventuring Gear and Bag of Books employ a "uses" mechanic that helps abstract the equipment buying process and encourages improvisation.
"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?