Features:

• 99.7% Filtration
• Convenient See Thru Dust Window so there's no guess when bag is full
• Desgined to fit All Hoover Windtunnell machines
• Also will fit Hoover Tempo
• 9 Bags Per Package

Editor Reviews:

Product Description:
These Mirco-filtration vacuum bags are 30% more efficient than the standard paper bags. They are designed to keep 99.7% of all dust .5 microns and larger in the vacuum bag. These are comparable with Hoover's Allergen Style bag, part number 4010100Y. These bags have a unique "Dust Window" in them, which is a clear strip in the middle of the bag that allows you to see how full the bag is getting. These bags fit the following Hoover model numbers;U5140-900; U5142-900; U5144-900; U5145-900; U5148-900; U5154-900; U5301-9RM;; U5330-900 U5330-900; U5393-900; U5394-900; U5395-900; U5395-940; U5395-960; U5395-970; U5396-900; U5396-960; U5397-900; U5398-900; U5398-990; U5399-900; U5402-900; U5403-900l; U5409-900 U5415-900; U5416-900; U5420-900; U5423-900; U5432-900; U5433-900; U5434-900; U5435-900; U5436-950; U5437-960; U5438-900; U5439-900; U5443-900; U5444-900; U5445-900;U5446-900; U5447-900; U5449-940; U5450-900; U5451-900; U5452-900; U5453-900; U5454-900; U5456-900; U5457-900; U5460-900U5461-900;U5462-900;U5463-960;U5464-900;U5465-900;U5465-960;U5465-970;U5465-990;U5468-900;;U5469-900;U5469-910;U5470-900;U5475-900;U5475-960;U5477-900;U5720-900;U5720-960;U5720-990;U5721-900;U5722-900;U5740-900;U5750-900;U5750-980;U5751-900;U5752-900;U5753-960;U5755-900;U5757-900;U5758-900;U5759-900;U5760-900;U5761-900;U5762-900;U5780-900;U6401-9RM;U6423-900;U6425-900;U6425-920;U6429-900;U6429-900;U6430-900;U6430-900;U6431-900;U6432-900;U6432-900;U6433-900;U6433-900;U6434-900;U6435-900;U6435-900;U6436-900;U6436-900;U6437-900;U6437-900;U6439-900;U6441-900;U6441-940;U6445-900;U6445-920;U6446-900;U6446-930;U6449-900;U6450-900;U6451-900;U6451-960;U6453-900;U6454-900;U6455-900;U6455-960;U6458-900;U6459-900;U6459-900;U6460-900;U6470-900;U6470-910;U6471-900;U6473-900;U6474-900;U6607-900;U6616-900;U6617-900;U6618-900;U6626-900;U6632-900;

Rating : - Great so far
So I've only used the first one, but it seems to be great so far :)