Your Height Size
	Small	Medium	Large	X Large
Inches	up to 5'0"	4'6"-5'8"	5'7"-6'3"	6'0"-6'8"
cm	up to 150	140-175	170-190	185-205

Source: Poler

In Our Opinion

The Poler Napsack can be be used as a sleeping bag or as a jacket, we therefore recommend that if your intended use is for sleeping don't be afraid to go big, however if you wish to use the Napsack as a garment smaller sizes may be more suitable. 

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