Not all bagless vacuum cleaners are the same. The type of separation system makes a big difference to the performance of the machine and the amount of filter maintenance required.
An upright vacuum cleaner has a vertical dustbin. In contrast, a cylinder vacuum cleaner has an almost horizontally positioned dustbin. Unknown to some, these two styles of vacuum cleaners offer both advantages and disadvantages. You should base your overall choice on the area you will be vacuuming and your individual preferences.
Having a vacuum that's specially designed for pet hair is essential for keeping the house clean and fresh, and ensuring that when you vacuum, the pet hairs and allergens are actually being picked up.