G'day Rhys,

Both the Regular and Long sizes fit in a Small compression sack, which is 10L>3.3L.
Hope that helps!

G'day Trixie,

The Compression Sack supplied with the Journey Jo1 - Long Bag is Small, so we'd recommend the Small size in the Compression Dry Sack too.

G'day Bill,

The size S /10L sack is the best option for the Tr2 sleeping bag.
Hope that helps!

G'day Adam,

Sea to Summit recommend the Small for TKI and the Medium for TKII.
Hope that helps!

G'dasy Krystal,

The Basecamp BcII Double requires an XL compression sack.

G'day Mark,

The Spark SpII requires a 2XS compression sack, which doesnt exist in the eVent Compression Sacks.
Ive just had a quick look through Sea to Summits full range, and they dont do a waterproof compression sack in this size.
The closest you'll get is the XS.

G'day Dan,

Sea to Summit specifies that the Small size compression dry bags are the best fit for the Flame Fm4 Regular and Long.

G'day Emily,

I've double-checked the recommended sack size with Sea to Summit. Both of these bags use the same size compression sack. The regular models need a Medium Compression Dry Sack, and the long models need a Large Compression Dry Sack.

G'day Mick,

You'll need the Extra Large size Compression Dry Sack for the Coleman Mudgee C-3.

G'day Han,

We had to go back and check the archives for this one, the compressed volume for the Talus III model is about 9L, so we'd recommend the Medium Size. You might just fit it in a small, but it would be a wrestle to get it closed, and we don't think it would provide enough folds to keep watertight.

G'day Jak,

I assume you're referring to the difference between the in use and packed dimensions on our site? If so, the packed dimensions refer to the sack in it's packaging as displayed in the final photo. The in-use diameter will remain the same with the length decreasing as you compress the sack. 

G'day Floyd,

Sea to Summit recommend the Medium Compression Dry Sack for the Trek III sleeping bag.

G'day Sue,

Sea to Summit classifies the Altitude ATII as fitting into their Medium size dry sacks, which are the 4.5L-14L size.

G'day Catherine,

You'll find the capacity in litres and the compressed volume for each size listed in the specifications list within the Details and Specs drop-down tab. 

G'day Jenny,

The Sea to Summit Talus WTSII Sleeping Bag packs down to around 7.1L when compressed. I'd recommend using the Medium Sea to Summit Compression Dry Sack because it starts at 14L and compresses down to about 4.5L.

G'day Jack, 

Normally we'd recommend someone pops into the store to give it a try but I'm not sure that'll work in your situation. I'd probably recommend the Medium Sea to Summit Compression Dry Sack. A compression sack can always be made smaller but it can't be made any bigger, plus if there's ever any excess room then you can always add your thermals or pillow in the back to compress as well. 

G'day Bill,

Whilst using a Sea to Summit Compression Dry Sack on your tent shouldn't damage it at all, I doubt that it will compress it much more than you'd usually expect from just rolling it up. 

G'day Fiona,

A high quality vinyl bag is going to be quite durable and abrasion resistant, and in general they’re made for taking with you out on the water for kayaking etc.

The compression dry sack is designed more to go inside your pack, and keep your gear completely dry and compressed - so it may be slightly less durable than something that’s designed to be out in the open where it’s going to get roughed around.