Excellent bags! I use them in a shop vac to suck ash from my pellet stoves and have no problems with dust exiting the vac when running! Caution! Only vac ash after a few days with no fire or hot ash.

Been having lots of trouble with bags ripping open during use. We use vacs in our business to collect dust from sheetrock finishing as well as grinding concrete floors before finishing. Watched videos of these in use for both types of cleaning as well as picking up water while filled with the accumulated dust. They appeared to hold up very well, wet or dry, so I bought 2 packages for a trial run. The first one used ripped during use, which disappointed, but the other 3 bags held up well. So, I have ordered a second batch for further evaluation, since anything man made is subject to occasional glitches. We'll see. One additional surprise was the price increase. In two weeks they had gone up by $2.oo. If they continue this trend I will not be able to keep up. Also, I have a hard time figuring the pricing. One package costs $21.95, two cost $57.80, and three cost $96.86. I realize these prices are by different vendors, but surely not many people are duped by this!!???!!

Further Update: In my haste to mend the pricing issue I failed to note that both the 2-pack and the 300-pack are sold by Amazon, while the 4-pack and 6-pack are from All-Wall. Must remember to read the entire listing before hitting the one-click. So, no duping is involved if you pay attention.

Update: We now have another floor grinding job, so since 3 out of 4 of my last order worked pretty well, I decided to get more of these for this much larger job. I estimated we needed 18 bags, so I at first ordered three 6-packs. Then my brain started working and I went back over the pricing. I found that in 2-packs they are $10.41 per bag, but in 6-packs they are $13.33 each. So, using my snappy intelligence, I cancelled that first order and went back to get nine 2-packs, only to find these nice folks will only sell me four 2-packs. Of course they'll let me buy 300 bags for $2,971.72, which does get the price down to $9.91 each, but I can't imagine living long enough to use 300. Very frustrating to say the least. We need to get started, so I went for the four 2-packs, but I am pretty ticked off . They need to review this strategy. I'm not quite sure what it is supposed to do for sales, but it got them backed off to 2 stars from me.

It fit and got me back to doing work that requires a HEPA. Will buy again.

Couldn't ask for a better bag, this helps my business in the clean up.

Worked as well as advertised.