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Contract cleaners wear their vacuums and hotel housekeepers push theirs — both are right, because the backpack-vs-upright question is really a route question. One architecture doubles open-floor coverage per hour; the other survives any operator and services in minutes. Here's the math that decides.

Commercial vacuums are bought on the wrong axis constantly — features instead of route math. Coverage per labor hour is the number that pays: backpacks double upright speed on open floors, uprights win spot work and any-operator fleets, and the wet/dry unit is the non-optional recovery insurance…