False Bottom Overbag - AD90 / Argon 67
False Bottom Overbag - AD90 / Argon 67 - Image 2
False Bottom Overbag - AD90 / Argon 67 - Image 3

False Bottom Overbag – AD90 / Argon 67

$170.00

This is a made-to-order item. Not in stock. See the home page for the made-to-order lead time.

These are overbags that are fully closed in the circumference, with a round sewn foot end, and an open top with a drawcord. The top drawcord can attach to the top drawcord of other Timmermade systems. They have a single pad strap to secure it to your pad. Since this overbag is closed, and attached to the pad, your inner system won’t have pass through access to attach. Drafts are controlled by the overbag so this is typically not necessary.

Built from one layer of Alpha Direct 4004 facing inward and one layer breathable yet windproof Argon 67 to the outside. The Alpha 4004 layer provides warmth while the Argon layer blocks wind and light moisture from the outside. Temperature rating is variable, but this overquilt will typically add around 10f degrees of insulation to a system. That amount of added insulation has proven highly successful at preventing internal condensation well into negative temperatures. If moisture management is not a concern, this overquilt can also be used as a comfortable inner bag liner to add warmth and separate your skin from your sleep system’s shell fabric.

Comes in 60/60/50/50 circumference (unless custom is selected) and 66/72/78 lengths.

The 60/60/50/50 x 72 version weighs approximately 7.5 – 8oz

If custom dimensions are used to follow the contours of the down system it’s meant to go over, a lighter weight can be achieved. However, if going this route, one should be very careful to not end up compressing the inner down system. There is a top shockcord with a mitten hook at the shock cord exit that can be used to connect to the shock cord exit of another Timmermade system so the two systems stay together. It is possible that it could be used to connect to other systems with a center draw cord or similar attachment point in the center.

Alpha Direct colors are subject to change as rolls run out and are re-stocked. If a roll runs out of a color you ordered, you will be contacted and given a new option.

Measure the outer dimensions of the system the overquilt will go over with a soft tape measure. Stuff pillows or similar inside to mimic your body. Do not compress any loft when measuring. Hold tape loosely. Keep in mind the overquilt has a drawcord footbox and the total length includes the part that will be cinched up. Unlike the drawcord footbox overquilts, where you’d measure the length from the center of the round foot end, with these you would simply measure length from end to end. Since there is a round sewn end, you don’t need to factor in length to cinch over.

Available on backorder

See instructions for measuring.
Ti Grey
Moroccan Blue
Dark Olive
Brick Red
Coyote Brown
Charcoal Grey
Black
Deep Purple
Moss Green
Dusty Blue
Light Grey
Bright red/orange
If you want to custom fine tune your fit, write in the dimensions you would like here in this format Top/Torso/Knee/Foot x Length. You can take the loose outside measurement of the down system at these points, which are 3rds along the length. Take the loose outside measurement of the length and enter this as the Length. Do not compress your down when taking these measurements. Do not exceed 72" in width or 90" Length. Questions should not be entered here.
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False bottom designs have been extremely successful with down systems at reducing weight and bulk while controlling drafts. Overbags work by adding insulation so moisture is pushed through the inner down system, but this tends to happen mostly in key areas. It rarely happens along the bottom or sides of your systems. It’s typically concentrated at the top, as heat and moisture leave the system here the most. A false bottom design makes a lot of sense here because you can limit the added insulation to the key areas and keep the total light and small.

Using a synthetic overbag is sometimes a necessary way to keep your down dry in really cold, or really wet environments. In really cold environments the moisture that your body puts out in the night will travel through your sleep system and condense wherever the dew point is, which is typically inside of your down loft somewhere. Adding an Alpha Direct Overbag to the outside pushes that dew point out of the down and into the Alpha Direct 4004 fabric. From here you can remove the moisture from your down and pack it away dry. The moist overbag can either be dried during the day, or left moist and packed separately. If the moist overbag is reinstalled over the down bag the next night your body temperature will continue to push the dew point into the Alpha Direct fabric and the down bag will continue to stay dry. The overbag will continue to accumulate moisture and will need to be dealt with at some point, but Alpha Direct is remarkably good at dealing with moisture. It does not lose loft and dries very fast.

In really moist environments above freezing, the moisture is likely to come from the outside. An Alpha Direct Overbag is not waterproof, but it can catch light moisture that comes in the form of condensation or contact with wet tent/tarp walls or whatever. This moisture will soak into the overbag and need to be dealt with at some point, but it creates a barrier between the moisture and your down system.

https://timmermade.com/technology/overbag-moisture-management/

https://timmermade.com/2025/03/overbag-quilt-selection/

Weight 0.25 kg

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