How many packing cubes do I actually need?

It depends on bag size. Reviewer sentiment in this pool suggests a 4-to-6 piece set covers most carry-on travelers, while 8-to-11 piece sets (BAGAIL 8, OlarHike 10, Veken 9/11) suit families or checked luggage. Larger sets draw frequent praise for value but some buyers note they end up using only a few of the cubes.