A 15L sightseeing kit
Lay out the day's contents and remove items that belong in your main luggage rather than the daypack. Check the largest rigid object against pocket and opening dimensions. A smaller bag works best when the contents are intentional, not when everything from a larger pack is squeezed into a reduced volume.
GO 15L closures and device storage
Look up the GO 15L instructions and practice the closures you expect to use. Decide where frequently needed items will sit while the main compartment remains arranged as intended. If you plan to carry a tablet or laptop, verify its storage explicitly instead of inferring a device sleeve from the backpack category.
