The Special Forces 1 is designed to go with the Special Forces bivvy bag. To have both zippers over each other is optimal. And central zippers are optimal, especially if you don't use a modern tent.
The bivvy bag adds approximately 3°C to the sleeping bag. Who uses a bivvy bag usually keeps the clothing on if he goes to sleep and if they aren't whet. Or he will change into dry spare clothing.
The average clothing in the evening around the freezing point and the bivvy bag boost the Snugpak Special Forces 1 down to the comfort limit of approximately 0°C.
Below this temperature starts real winter camping and people would take the Special Forces 2, a larger rucksack and generally slightly different equipment.
Thats why the SF1 in the whole bivvy bag sleep system works comparable to a warmer side zipper sleeping bag that's designed to use it in a tent.
And if you aren't a pure summer camper it's quite interesting that the SF1 is part of the modular Special Forces complete system. Together with adapter and SF2 you can create a very warm but very comfortable sleeping bag for really cold weather with a perfect warmth regulation.
The Special Forces System is Snugpak's top model and one of the options that's issued to NATO armies. If NATO soldiers get something else it's usually the Carinthia modular System Defence 4 + Tropen + Bivvy bag or a copy of that or the similar US army system.
The Snugpak system is in my opinion the best choice for civil users. If you search you will find in this forum my detailed descriptions of these systems in comparison.
I wouldn't buy a bivvy bag with a side zipper. That can't work properly. If you have such a weak point it has to be located under the other one directly under your nose. Like this you can roll onto the side and protect both against heavy rain.
That's impossible with a side zipper.
You either would expose it to the wind or put it in a pool underneath you.
I generally recommend to look first what's currently issued to NATO armies. What's issued to the most ones is usually the best option. If there are differences they are usually due to the weather conditions in the different countries.
Everything else is usually a less good option if we talk about general purpose items. The civil market offers you all and everything because they earn the more the more errors the clients make. The military surplus market offers you stuff that simply works. If you get this equipment factory new you get the best of the best. Exceptions from this rule are very very rare.
Most military sleeping bags have a central zipper.
The bivvy bag adds approximately 3°C to the sleeping bag. Who uses a bivvy bag usually keeps the clothing on if he goes to sleep and if they aren't whet. Or he will change into dry spare clothing.
The average clothing in the evening around the freezing point and the bivvy bag boost the Snugpak Special Forces 1 down to the comfort limit of approximately 0°C.
Below this temperature starts real winter camping and people would take the Special Forces 2, a larger rucksack and generally slightly different equipment.
Thats why the SF1 in the whole bivvy bag sleep system works comparable to a warmer side zipper sleeping bag that's designed to use it in a tent.
And if you aren't a pure summer camper it's quite interesting that the SF1 is part of the modular Special Forces complete system. Together with adapter and SF2 you can create a very warm but very comfortable sleeping bag for really cold weather with a perfect warmth regulation.
The Special Forces System is Snugpak's top model and one of the options that's issued to NATO armies. If NATO soldiers get something else it's usually the Carinthia modular System Defence 4 + Tropen + Bivvy bag or a copy of that or the similar US army system.
The Snugpak system is in my opinion the best choice for civil users. If you search you will find in this forum my detailed descriptions of these systems in comparison.
I wouldn't buy a bivvy bag with a side zipper. That can't work properly. If you have such a weak point it has to be located under the other one directly under your nose. Like this you can roll onto the side and protect both against heavy rain.
That's impossible with a side zipper.
You either would expose it to the wind or put it in a pool underneath you.
I generally recommend to look first what's currently issued to NATO armies. What's issued to the most ones is usually the best option. If there are differences they are usually due to the weather conditions in the different countries.
Everything else is usually a less good option if we talk about general purpose items. The civil market offers you all and everything because they earn the more the more errors the clients make. The military surplus market offers you stuff that simply works. If you get this equipment factory new you get the best of the best. Exceptions from this rule are very very rare.
Most military sleeping bags have a central zipper.
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