The Sleep Suit sack is an award-winning, multi-functional sleep sack and Sleep Suit with legs in one, for babies, toddlers and kids.
Size Guide
Sleep Suit Sack
Please use your child's weight to find the most appropriate and safe size for them. The Sleep Suit Sack should be fitted around the neck and the armholes to avoid your child slipping through. In 'legs' mode, there should be enough length at the end of the suit to allow your child to move their feet freely. 2.5 TOG and 3.5 TOG Sleep Suit Sacks should not be used in a 5-point harness or car seat for safety reasons.
| ergoPouch size | 3-12M | 8-24M | 2-4Y | 4-6Y | 6-8Y |
|---|---|---|---|---|---|
| Same as size | 000-1y | 00-2y | 2-4y | 4-6y | 6-8y |
| Pouch length (cm/inch) | 80cm / 31.5" | 90cm / 35.4" | 105cm / 41.3" | 120cm / 47.2" | 135cm / 53.1" |
| Sleeve length (cm/inch) | 28cm / 11" | 32cm / 12.6" | 36cm / 14.2" | 43cm / 16.9" | 50cm / 19.7" |
| Child weight (kg/lb) | 6-12kg / 13-26lb | 8-14kg / 18-31lb | Follow height markers | Follow height markers | Follow height markers |
| Child height (cm/inch) | 62-84cm / 24.4 - 33.1" | 68-92cm / 26.8 - 36.2" | 92-108cm / 36.2 - 42.5" | 108-120cm / 42.5 - 47.2" | 120 - 130cm / 47.2 - 51.2" |
*Previously size 2-12 months
- Free delivery on orders over $70*
- Estimated dispatch: 15 February 2026
- 30-day returns and exchanges
- Scott N.Verified Buyer2/6/26ReviewingSleep Suit Sack 2.5 TOG Elephant ParadeRated 5 out of 5 starsCosy baby 👶
This is the 4th or 5th Ergo sleeping bag we’ve bought for our granddaughter since she was born. She loves her sleeping bag and now gets it herself when she’s feeling sleepy or for her midday nap. Even at the age of 2 she is still using it, as she would tend to kick off sheets and blankets and then get cold. Definitely a worthwhile purchase!
- JAVerified Buyer1/22/26ReviewingSleep Suit Sack 2.5 TOG SageRated 5 out of 5 starsWorks well
Keeps baby warm without overheating. Game changer for rooms that you can’t seem to keep warm. We use for temperatures 61-65F with pajamas that are long sleeve with pants. That works well for us. If it’s warmer than 68F, we typically use the pajamas listed above and a different sleep sack. But this is our cold midwestern US winter sleep sack bar none.
- Jordan A.Verified Buyer1/22/26ReviewingSleep Suit Sack 2.5 TOG Fruit SaladRated 5 out of 5 starsAbsolutely Perfect
Absolute game changer for us. Despite properly insulating the house, our toddlers room and our is the furthest from the furnace and above the garage. Meaning even with the thermostat set to 70F, it can get as cold as 61F in his room. Not a fan of space heaters as they should never be run unsupervised. So this was my only option and it has made a huge difference. Our toddler sleeps so well and I don’t have to worry about him freezing or overheating. Absolutely perfect.
