You will need some epoxy resin and carbon fiber. The strength from carbon fiber comes from the lay up as it's only strong in tension. You need to put down several layers with proper orientation to get good strength.
You can get materials from some place like Fiberglass Supply. Marine supply...
Espar and Webasto are big names. I'm not sure I would trust one of the cheap Chinease units, although some people seem to be happy with them. I have an Espar and it works well. Diesel heat is nice as it doesn't create any moisture like burning propane, but does require electricity for the...
Like others have said, get a larger pack with adequate compression straps. As long as you can get everything cinched down so your load isn't shifting, you probably won't notice the slight extra weight of the larger pack.
That being said, I would like to know what you guys that need a 6000 cu in...
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6.5 creedmoor for your needs. Short action, ammo is cheap. Better than .308 at longer distances (better BC bullets). Least recoil.
If you wanted one do it all rifle, then the 7mm PRC is a good choice. But it's long action, ammo is more expensive, and more recoil.
There are pros/cons to having one device vs multiple. Having everything in one is faster and less gear to carry. However, if it gets damaged or breaks you may loose all functionality. Also, you may want to upgrade one function, but are fine with the rest, or it may be difficult to get the best...
Northern-Noman nailed it. Mittens over gloves is highly recommended. I use a pair of wool gloves with water proof shell/membrane mittens that have a removable insulating layer. This works well for most conditions.