The quick reply is greater than you in all probability ought to. Compressing down feathers damages them over time however they will squeeze down magnificently.
Our testers have compressed a -40-degree bag right into a 10L compression sack. That isn’t advisable however in case you want house in your pack, you’ll do no matter it’s a must to.
Packing down takes persistence. Making use of mild stress to take away air from between the down can squeeze it into tight areas. Examine along with your producer’s listed pack dimension. It is a good indication of how far to take it.
For instance, one in every of our favourite sleeping baggage, the Montbell Down Hugger, has a 3L listed pack dimension within the common size. Evaluate that to the NEMO Forte at 12 L at a comparable temperature score.
Once you retailer your down sleeping bag, at all times put it within the massive offered sack or bag concerning the dimension of a 55-gallon trash bag to delay the lifetime of the down and permit for full growth whereas in storage.