The Festool 204308 Self-Cleaning Filter Bags For CT 15 / CT MINI I / CT MIDI I, 5-Pack is a replacement dust extractor filter bag set for select Festool vacuums. This is a dust bag designed for collecting and containing dust and debris during cleanup, sanding, and general extraction work. Model Number 204308. If you use a Festool CT 15, CT MINI I, CT MIDI I, or compatible CTC MINI/MIDI extractor, these bags matter because they help maintain suction while making disposal cleaner and faster.

What separates these from a basic vacuum bag is the SELFCLEAN fleece construction. Festool designed the bag material and shape to reduce dust cake buildup as the extractor runs. In real use, that translates to better use of the bag volume and more consistent suction instead of having performance drop off as the bag fills. For anyone doing fine dust work, that is the whole point: less clogging, less wasted bag space, and less frustration when the extractor starts feeling choked down.

The collapsible bag design also matters more than it sounds on paper. When dust packs tightly into the corners of a standard bag, airflow suffers and the bag can look full before you have actually used much of its capacity. This Festool dust bag is built to collapse and shed packed dust more effectively between cycles, which helps the extractor keep pulling. If you are collecting sanding dust, jobsite debris, or class L and M dust within the machine's intended use, that steady airflow is a real benefit.

From a practical jobsite standpoint, these filter bags are about cleaner handling as much as suction. The bag captures and contains debris so removal is less messy when it is time to change it out. That is especially useful when you are working indoors, in finished spaces, or anywhere you do not want a cloud of collected dust escaping during disposal. It is a simple accessory, but it directly affects how clean the whole extraction system stays.

Compatibility is the big thing to get right here. These bags are intended for Festool CT 15, CT MINI I, and CT MIDI I dust extractors, along with CTC MINI/MIDI units, and they are specifically for the newer generation from model year 2019 onward. They are not compatible with CT MINI and CT MIDI models made before 2019. The easy rule: if your CT MINI or MIDI has the newer digital control panel, you are in good shape. If it has front knobs, these are not the right bags.

Capacity is listed at 4.0 gal (15 L) in Festool source data, with one supplementary source listing 2 gal. Because the manufacturer data points to 15 L, that is the figure to pay attention to here. Either way, this is not a random universal vacuum bag. It is a Festool-specific replacement accessory for users who want the extractor to perform the way it should.

Who should buy these? Anyone already invested in a compatible Festool dust extractor and doing regular sanding, trim work, remodeling, shop cleanup, or service work where dust control matters. If you own the right machine, the Festool 204308 Self-Cleaning Filter Bags are the right consumable to keep on hand. If you own an older pre-2019 CT MINI or CT MIDI, stop here and double-check before ordering, because fitment is the whole story with this product.

Festool 204308 Self-Cleaning Filter Bags keep your extractor working like it should

If you own a compatible Festool extractor, this is the right kind of consumable to buy once and keep on the shelf because steady suction and cleaner disposal are worth it every time.

• Who it's for: Festool CT 15, CT MINI I, CT MIDI I, and CTC MINI/MIDI users doing regular dust collection, sanding, and cleanup work.
• Why it stands out: The self-cleaning fleece bag design helps use more of the bag volume while maintaining suction better than a basic bag.
• Worth knowing: Fitment is everything here. These are for 2019-and-later CT MINI and CT MIDI machines, not the earlier versions.

• What dust extractors do these filter bags fit? They fit Festool CT 15, CT MINI I, CT MIDI I, and compatible CTC MINI/MIDI extractors, with CT MINI and CT MIDI compatibility applying to 2019-and-later models.
• Will these fit older CT MINI or CT MIDI vacuums? No. These are not compatible with CT MINI and CT MIDI models made prior to 2019.
• What is the bag material? The bags are made from durable self-cleaning fleece material.
• What is the maximum filling volume? Festool manufacturer data lists the maximum filling volume as 4.0 gal (15 L).