compression sacks for belay jacket: how to size?

[lorcar]

looking to get a SeaToSummit compression sack for my Pat MacroPuff M size.
I see the sack comes with different size, how do i know in advance which is the right one?
thanks in advance

[MakersTeleMark]

looking to get a SeaToSummit compression sack for my Pat MacroPuff M size.
I see the sack comes with different size, how do i know in advance which is the right one?
thanks in advance

Stuff it into a nalgene and use your estimate based upon whether you can go smaller or not.

[TexasGortex]

Over the course of many years buy the wrong size for many projects. Eventually you will have a robust supply for trial and error.

[MagnificentUnicorn]

Don’t use one, just pack it into your pack to fill space.


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[Ørion]

Don’t use one, just pack it into your pack to fill space.


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This is the way.

The ultralight backpacking community can get a little wacky at times, but their dedication to minimizing stuff sacks is a good aspect. They're just unnecessary weight and makes easy-to-pack stuff much more awkward to do so.

[MakersTeleMark]

This is the way.

The ultralight backpacking community can get a little wacky at times, but their dedication to minimizing stuff sacks is a good aspect. They're just unnecessary weight and makes easy-to-pack stuff much more awkward to do so.

Agreed. I don't even use one for my pot or quilt.

[rod9301]

I always use a stuff sack for my emergency down jacket when i go bc skiing, mainly because i don't want to get it wet.

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[Tjaardbreeuwer]

@Rod9301 and @Magnificentunicorn both have valid points.
I sometimes use one for my down jacket, to keep it dry. But, if your pack has separate pockets, so you can keep wet items away, and it is a cold day, there is less need for that.

@Lorcar is using a synthetic jacket, not down though, so that is one more reason not to use a stuff sack.

even if you want/need to use a bag to keep your jacket dry, I never use a compression bag for this:

• They are unnecessarily heavy and bulky. The extra volume and weight of the cords and fabric could be used for more insulation
• those cords and lids catch on stuff as you pull it out, leading to other items falling out
• when used as intended, when you compress your item, you end up with a big ball. There is no empty space in a ski pack shaped like a large ball

Instead, if I want to protect my jacket(or other fluffy gear), I use an air evac dry bag(the ones with an E-vent bottom), or a zippered dry bag made from DCF. Those let you force out air to compress the item, but you use the backpack itself, along with the other items in your pack, to apply the compression.
Using a slightly over sized bag helps with this.
Fill your pack, insert the empty dry bag, stuff your jacket into it, making sure to go down and out into the corners of your pack, then close the Drybag.

in the case of @Lorcar, I would just stuff the Macropuff into my pack loose, using it to fill empty corners etc.

[Ørion]

The happy middle ground between not using bags at all and compressing all your stuff into unpackable footballs are liners.

Grab either trash compactor bags, if you want durable, or Nylofume bags, if you're a weight weenie, and place your "can't get wet" items in one of those. Compress a little air out of it, roll the top down, and stuff into your primary bag. Should keep things dry up to full immersion.

[lorcar]

Thanks everyone. My point was more space saving than keeping it dry. The Macro doesn't compress into its own pocket and has a separate bag that is not the smallest. The compression pack I got is quite light to be honest (sea to summit Ultra Sil). So my question was around avoid damaging the jacket, which is there just for emergency.


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