Alpha Direct 4004 Overbag

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

While we call these “overbags”, technically they are overquilts with a closed footbox and an open upper 2/3rds with a snap closure at the top. The top drawcord can attach to the top drawcord of other Timmermade systems.

An overbag built from one layer of Alpha Direct 4004. Alpha Direct is extremely breathable without a wind blocking layer, so the added warmth will be more variable. If using this between a down system and a bivy sack, the added warmth is likely to be similar to the Alpha / Argon overbag, which is around 10 degrees. If using a bare Alpha overbag over a down system with no shell covering it, you can expect less added insulation, even in the still air of a shelter. If there is any air movement, it will cut right through the Alpha and greatly reduce its added insulation. While this will certainly feel less warm, it’s still untested as to whether this air cutting through the Alpha could be helpful in moisture management. The Alpha / Argon will be a warmer overbag, which will be more likely to reliably move your dew point and trap that moisture. However, the bare Alpha bag could, in theory, move the dew point just enough when the air is still, and when the air is moving through, it may allow that moisture to move out while you’re sleeping. The initial purpose for including this bare Alpha overbag is for use with a bivy, since a bivy user would be adding a redundant shell if they were to use the Alpha / Argon version under a bivy. If moisture management is not a concern, this overbag can also be used as a comfortable inner bag liner to add warmth and separate your skin from your sleep system’s shell fabric.

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.

Comes in 58″ wide x 81″ long unless specified otherwise and weighs approximately 9 – 11oz. 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 and a footbox drawcord. There is 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.

Measure the outer dimensions of the system the overbag 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 overbag has a drawcord footbox and the total length includes the part that will be cinched up. When measuring the length of the inner system, don’t just measure the horizontal length. Start from the center of the footbox, up, over, and along its length.