US Modular sleeping bag - Intermediate bag, surplus
The new US Army modular sleeping bag system is probably the best there is. This is the inner Intermediate bag, and can be used alone in coldish weather. Essentially a three-season bag.
Note: Some of these are Foliage Green, some black, pick yer favourite. The only difference is the colour.
About the whole system
Meant to be usable in any environment or weather, the US Army modular sleeping bag systems has it all. The innermost bag is the Intermediate bag, and it is attached to the inside of the Patrol bag. If waterproofing or additional protection is required, a Gore-tex bivy cover will snap on top of the whole thing. The intermediate bag alone offers tolerable sleeping conditions for up to -10 degrees Celsius, the Patrol bag to 10 degrees Celsius, and with the whole deal, the system should provide comfort for up to -30 degrees. The modularity has the added benefit of capturing insulating layers of air between the bags.
This particular item
This is the Intermediate bag, which is a good choice for as cold as -10 degrees. The outer material is 70-denier nylon fabric, and the stuffing is Polargard HV polyester, which does not absorb too much moisture and dries pretty quickly if it gets wet.
The bag closes with a heavy-duty zipper, and has a large hood. The zipper is accompanied by snap fasteners, to which the other components can be attached.
The foot space has double insulation. At the chest height there is a tightening strap which prevents warm air from escaping the lower parts of the bag.
Size and care
The bag is about 216 cm long (suitable for up to 185 cm / 6'1" persons) and weighs about 2 kg.
Washing sleeping bags should generally be done as little as possible. If the need arises, do it in 40 degrees Celsius. However we suggest using a separate liner bag to essentially remove the need to wash the main sleeping bag. If the bag gets wet or is washed, open the zipper and hang dry.
Used army surplus
These are used but in nice, clean and serviceable condition. Being used, we can't guarantee the condition of each and every snap fastener. Generally there are quite enough of them intact to attach other sleeping bag parts securely.
No stuff sack included!
Sleeping bag size selection guideWe recommend reading this.
Psst, wanna buy a used sleeping bag?We recommend reading this.
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Dustin G. 20.02.2019
Adam G. 06.04.2019 (Edited 04.05.2019)
Some clarification on the difference between the black (older) and grey (newer) bags: The black bags will feel undersized if you're over about six feet tall. When they introduced the grey set with the UCP bivy cover, one of the changes was to increase the OAL of all the bags by a few inches to solve the common complaint of "this bag feels too short for me." In addition, the grey bag uses more modern insulation, and is thus both slightly lighter and packs down to a slightly smaller size than the old black model. The temperature rating for both is the same.
Either one will serve you fine. Don't get too caught up on which one's 5% better.