Is a backpack vacuum better than a canister for commercial cleaning?

For large open floors and overhead work, yes. The backpack keeps the hose with you and frees both hands. A canister is easier to park and store and better for detail cleaning.

How heavy is it to wear?

It weighs about 9.8 pounds. That is light for a commercial backpack vacuum, but the weight sits on your shoulders and back for the whole job.

It uses a filter bag, so you replace bags as they fill. That keeps emptying clean and suits commercial use.

Can it clean both carpet and hard floors?

It is a general-purpose commercial vacuum with a hose and floor tool. It handles hard floors and low-pile carpet; deep carpet cleaning is better left to an upright.

Janitorial staff, cleaning businesses and anyone with large floors, stairs or high surfaces to clean. Casual home users may find a canister easier to store.