Sea to Summit eVac Compression Dry Bag, Waterproof Compression Sack, 13 Liter, High Rise Grey

Across the reviewers we read, the 13L eVac Compression Dry Bag has emerged as the de facto sleeping-bag size in Sea to Summit's lineup. outdoorgearlab.com calls it a great choice as a sleeping-bag stuff sack when backpacking in wet, rainy environments, and r/Ultralight threads on packing sleeping bags repeatedly name-check the 13L specifically as the size users land on after experimenting.

rei.com customer signal (verified tier) highlights the durable, water-resistant construction and the oval base that keeps the bag from rolling around inside a pack — a small detail that reviewers across creativesustenance.com and backcountrymagazine.com call out for actual pack-organization benefit. The field-repair buckle gets repeated praise in the trailgroove.com write-up as a meaningful trail-fix feature on a category where buckle failure usually ends the bag's life.

Where reviewers push back: an r/Ultralight thread we read notes that down sleeping bags tend to expand to fill the 13L, meaning the practical compressed size is only as small as the bag itself wants to be. That's a fit issue, not a defect, but it argues for sizing down to 8L for true ultralight quilts.