Lightweight Baby Sleep Bag 0.5 TOG in Tanboocel® Bamboo Viscose - Cozy Forest

Summer without air conditioning is a sleepwear problem before it's anything else. This is the summer answer.

Sleeping foxes, sleeping owls, deer and badgers — the woodland-nursery starter pack.

This is the lightest sleep bag we make, rated for nursery temperatures between 75 and 81°F — summer nights, top-floor bedrooms, and homes that don't run central air. When a 1.0 TOG starts to feel like too much, this is the one you reach for.

Material. Tanboocel® Bamboo Viscose, blended with cotton and woven into open-weave muslin. Tanboocel® is a branded bamboo viscose made through a closed-loop process — third-party verified, with a lower water and chemical footprint than the generic bamboo rayon most brands quietly label "bamboo." It gets softer after the fifth wash than on day one, the opposite of how cotton ages.

The print. Ivory ground with soft watercolor woodland scenes — caramel deer, sleeping orange fox, sleeping blue owl, gray badgers, birds, mushrooms, slender trees.

Construction. Sleeveless on purpose, so your baby sheds heat instead of trapping it. A two-way zipper runs the length of the bag, so a midnight diaper change takes seconds and wakes nobody. The neck and arm openings are bound in soft fabric, not scratchy serged edges, and cut snug — the part that matters most for safe sleep.

Why 0.5 TOG matters. Most premium brands skip this weight; their lightest options start at 0.6 or 0.7 TOG and run warmer than the label suggests. That leaves hot nurseries choosing between a blanket, which the AAP advises against, or no sleep sack at all. A true 0.5 TOG muslin solves both.

Need a warmer weight? The matching 1.0 TOG TENCEL™ Sleep Bag in Cozy Forest is built for the everyday 69–75°F nursery. The 2.5 TOG winter weight picks up below 68°F.

Sizing. 0–6M (fits 8–18 lb), 6–18M (fits 18–28 lb), 18–36M (fits 28–38 lb). Always size to current weight, not age. A neck opening that's too wide can ride up over your baby's face during the night, which is why a snug fit there matters.

Care. Machine wash cold and tumble dry low. Tanboocel® takes the dryer better than bamboo rayon, with less pilling and shrinkage over time. Don't bleach; iron on low only if you need to.

Safety & certification. AAP safe-sleep compliant and tested to CPSC, CPSIA, and ASTM standards. The material is certified to OEKO-TEX Standard 100, and Loulou Lollipop is a Certified B Corporation.

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Free US shipping over $65. Free 30-day returns on unworn items in original packaging.

Part of the Big Dreams Sleep System. Our sleepers and sleep bags are built to layer together through the night. Build the set from the sleep bags and sleepers.

All US orders over $65 ship for free! Shipping is $7 for orders under $65.

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Change your mind? Regular-priced items can be returned within 30 days of purchase, as long as they're unworn, unwashed, and unused with original tags and packaging intact. Sale and marked-down items are final sale.