# Sleep sack sizing across TOG weights Do these ergoPouch sleep sacks run true to their labeled size, or does fit change between TOG weights? ergoPouch Cocoon Swaddle Sack: Parents report that the same nominal size fits very differently between TOG weights, with one saying the 2\.5 and 3\.5 TOG bags of the same size were markedly different\. The maker's size guide says to choose the size by the child's weight, not by age\. ergoPouch Cocoon Swaddle Sack 2\.5 TOG Willow: Some users report the swaddle runs small; one baby of average size was already snug in size 000 at 6\.5 weeks, and users advise sizing up\. ergoPouch Cocoon Swaddle Sack: A parent reported that the 1\.0 TOG version was far more spacious than the warmer TOGs, so it did not hold the baby's arms in like the snugger warmer bags\. ergoPouch Cocoon Swaddle Sack 1\.0 TOG: Parents of around three\-month\-olds report the gap between the 0\-3M and 3\-12M sizes leaves the fabric riding up over the face when the baby moves its arms\. One parent bought two identical newborn swaddles and found them 50cm and 54cm long with different stitching; the brand attributed it to two manufacturers\. ### 1. [ergoPouch Cocoon Swaddle Sack \(called Cocoon Swaddle Bag on the Australian maker page\)](/products/ucp/ergopouch-com/8279849894057) (sold by ergopouch\.com) Parents report that the same nominal size fits very differently between TOG weights, with one saying the 2\.5 and 3\.5 TOG bags of the same size were markedly different\. - Fit across TOG weights: Parents report that the same nominal size fits very differently between TOG weights, with one saying the 2\.5 and 3\.5 TOG bags of the same size were markedly different\. (review) - Sizing notes: The maker's size guide says to choose the size by the child's weight, not by age\. (manual) - Size chart: Size 0000 \(Newborn\) is 52 cm pouch length, for 3\-4 kg and 55 cm child height\. (manual) ### 2. [ergoPouch Cocoon Swaddle Sack 2\.5 TOG Willow](/products/ucp/ergopouch-com/8261735055529) (sold by ergopouch\.com) Some users report the swaddle runs small; one baby of average size was already snug in size 000 at 6\.5 weeks, and users advise sizing up\. - Fit across TOG weights: Some users report the swaddle runs small; one baby of average size was already snug in size 000 at 6\.5 weeks, and users advise sizing up\. (review) - Sizing notes: - - Size chart: Size 0\-3M \(000\) has a 60 cm pouch length, a child weight of 3\-6 kg and a child height of 62 cm\. (manual) ### 3. [ergoPouch Cocoon Swaddle Sack \(also sold as ErgoCocoon and Cocoon Swaddle Bag\)](/products/ucp/ergopouch-com/8806347440297) (sold by ergopouch\.com) A parent reported that the 1\.0 TOG version was far more spacious than the warmer TOGs, so it did not hold the baby's arms in like the snugger warmer bags\. - Fit across TOG weights: A parent reported that the 1\.0 TOG version was far more spacious than the warmer TOGs, so it did not hold the baby's arms in like the snugger warmer bags\. (review) - Sizing notes: - - Size chart: For size 0\-3M \(000\) the pouch length is 60 cm, for a child weight of 3\-6 kg and height of 62 cm\. (manual) ### 4. [ergoPouch Cocoon Swaddle Sack 1\.0 TOG](/products/ucp/ergopouch-com/8312063852713) (sold by ergopouch\.com) Parents of around three\-month\-olds report the gap between the 0\-3M and 3\-12M sizes leaves the fabric riding up over the face when the baby moves its arms\. - Fit across TOG weights: Parents of around three\-month\-olds report the gap between the 0\-3M and 3\-12M sizes leaves the fabric riding up over the face when the baby moves its arms\. (review) - Sizing notes: One parent bought two identical newborn swaddles and found them 50cm and 54cm long with different stitching; the brand attributed it to two manufacturers\. (review) - Size chart: - Every value in the table is a fact RoboTrunk checked, linked to the page it came from\. A dash means no checked fact fills that cell\. Prices and stock change, so this page prints neither: each product name links to its RoboTrunk page, which shows them live\. Written 2026-10-23T07:40:23.041Z. 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