The last batch of bags I received fell apart - the inner lining was always torn no matter how many times I used the vacuum. I will try the allergen bags and see if they are more durable.
I've been using an Orek Iron Man for over 15 years and it still works well. The bags are less than what I pay locally and I have to drive 8 miles to get them. These bags work well despite being small. I mostly stuff bags with animal hair and change them often.