venting without zippers

TIMMERMADE
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​For all their convenience, zippers are heavy and somewhat prone to failure. In full sleeping bag lengths they can often add a full ounce to your sleep system. They can snag and pull on the ultralight fabrics making it necessary to reinforce the area around it, further adding to the extra weight. Lastly, they require draft tubes or some sort of system to cover over the uninsulated area where the zipper is....and of course, it isn't all that uncommon for them to fail. On a camping quilt, we just get rid of it, along with the whole bottom of the bag, which is redundant weight. However, my false bottom bag design provides an opportunity to approach venting a sleep system differently. First, the top drawstring can be used for primary upper body venting by opening it and sticking an arm out or pulling it fully down to the waist. Next, the false bottom of these bags can be spun around to the side or top, allowing heat to escape through the single layer fabric without exposing the body to the outside. It's kinda like sleeping under a sheet on a hot summer night. Beyond this a sleeper can get out of the bag entirely and drape it over themselves  as needed on hot nights. Additionally, a drawstring footbox can be added which allows the sleeper to open the bottom to vent and even pull the footbox up, sticking feet and legs out. A side benefit of the drawstring footbox, not related to venting, is the ability to get up and walk around in your sleep system. These tend to add around .5 to 1 ounce to the finish weight. With all of these venting options sometimes it just isn't necessary to use a zipper. It's a particularly attractive route for those going ultralight and/or looking for bombproof gear. 
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  • Home
  • Shop
    • Sleep systems >
      • Horizontal baffle sleep systems
      • Vertical baffle sleep systems
      • Balaclavas
      • Synthetic sleep systems and overbags
    • Clothing
    • Fabric by the yard
    • Accessories
    • In stock items
    • Custom
  • Technology
    • Down sourcing
    • Differential cut
    • False bottom sleep system
    • Non-integrated hood sleep systems
    • Overstuff
    • Vertical split baffles
    • Horizontal baffles
    • Venting without zippers
    • Synthetic overbag for moisture management
    • Camping quilts
    • Drawcord footbox
  • Sizing jackets/sweaters
  • Sizing sleep systems
  • Care and use
    • Storage and compression
    • Sleep system drawcord exit location
  • About
  • Contact
  • Blog
    • Warmth metrics in box chamber down items
    • Why I prefer false bottom bags over quilts
    • Sewn through baffle construction and it's effect on warmth
    • My personal kit >
      • Sleeping bag/quilt
      • Packs/Bags
      • Clothing