Embedded Files
LayErs
Bivy Sleep System
Layers:
1-SHELL
a-Bivvy=---with snaps built in around the air mattress. Moisture barrier=heavier silnylon on bottom & breathable UltraTex on top. The bag would be large enough to fit several layers on top of user.
b-AirMattress---bag is fitted to certain air mattress size ranges. . ThermaRest NeoAir has heat-reflective baffles in it. Self-inflating mattresses have some R value from the foam inside. Light fabric corner brackets &mid-strap could also keep a foam mattress under for snow camping, in addition to/in place of the internal air mattress.
c-Screen for head for warm weather, to keep bugs out & release vapor.
d-Screen at footbox---for hot weather, you could have flow-through ventilation.
e-Tie-outs--to hold bag down, & to lift head/foot boxes, if you wish.
2-BASE LAYER, like in clothing)
a-Silk Bottom Sheet-- layer is snapped to that, forming a sleeve for the sleep pad, & a bottom sheet, which doesn't shift when you move in the bed, or let the air mattress move. It is machine washable to keep your air mattress & sleep system clean. Using double-sided snaps, it snaps to the bivy, leaving attachment points to the layers above.
b-Silk TopSheet ( to provide warm weather cover & add 5-10F insulation. In hot weather, the bivy may be left open with this top sheet being a mosquito barrier, since silk has a tight weave. TopSheet is also machine washable to protect other bedding. Using double-sided snaps, it snaps to the bottom sheet.
3-INSULATION--Layers are shaped broader at shoulders & hips, & narrower at feet, but not a true mummy configuration. It is roomier than a mummy, partly just to allow for more freedom of movement, & partly to allow for thick layers on insulation inside the bag. The top part is similar to a cheapo wide square sleeping bag. They don't need to be quite as wide as a camping blanket, because of the snap at the back, which keeps it from allowing drafts, so less material is used because it is not required to tuck all the way under user on both sides.
Each layer is rated for degrees of warmth provided. User would take whichever ones suit the weather conditions. Example: Lets say the user expects temp to drop to 20F, & he likes to sleep at 60F. Layers might be like:
--BivyShell=10F
--TopSheet=5F
--Heat-reflective metalized, breathable sheet=10F
--Down bag=20F
Target=60F - 10-5-10-40= -5F, which is too much, so he might substitute the 40F down quilt for a 20F down quilt, which brings him to 15F, which is close, & allows for a little unexpected microclimate, to be on the safe side. Everything listed above packs down quite small & light. If he worries there might be significantly wet conditions, he could substitute a Primaloft quilt for the down one. Even though it doesn't compress as small as down, it handles moisture better.
Draft Collar--especially on the biggest insulation.
We give approx ratings, & expect each user to assign their own set of numbers to each, & to judge conditions for themselves. If they want more control of the temp, they may substitute more thinner layers in place of large down blanket, for instance.
One advantage is that each layer can be thrown back to regulate temp during night. The snaps along edge of each layer allow user to easily move them all together, or independently. They can also be fastened to the top of the shell, to throw them all back all at once, or separate from the shell top, so the shell can stop drafts, & the layers can be thrown off/pulled over, as you need them. The shell could also provide critter control barrier.
Light Reversible
LayErs Sleeping Bag System
Same as LayErs Bivy, except that shell is lighter & not designed to be weather protective--designed to be used in a tent or tyvek bivy, etc. The outer bag is 1.4 oz silver metallized ripstop nylon on---silver on one side & color on the other. If weather is hot, wear it silver side out. If cold, use with silver side in, to reflect body heat.
Layers would still fasten in the way they do in LayErs Bivy.
Serape----LayErs can be made with an overlapping slit 1/2 way down, to act as a neck hole to be worn as a poncho liner or vest, when not in sleeping mode. In sleep mode, the overlapping flaps would prevent drafts.la Layers can be made of many different materials: wool, fleece, down, synthetic fill, etc of different thicknesses & warmth ratings. User would combine different layers for different conditions & preferences.
WetSuit---Heat-reflective (Tyvek ?) Poncho that goes with LayErs poncho liners--some arrangement for sleeves that fasten on. & pants w/ gaitors.
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