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Baby Muslin Sleep Bag 0.5 TOG in Tanboocel® Bamboo Viscose - Astro Explorers
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The lightest sleep bag we make, rated for warm nurseries between 24 and 27°C: summer nights, top-floor bedrooms, and the many homes that were never built with central air. When a 1.0 TOG bag starts to feel like too much, this is the one to reach for instead. Made from Tanboocel® Bamboo Viscose blended with cotton and woven into an open-weave muslin, the fabric is genuinely breathable rather than just lightweight; Tanboocel® is a branded bamboo viscose made through a closed-loop process that's third-party verified, with a lower water and chemical footprint than the generic bamboo rayon many brands quietly label "bamboo." It gets noticeably softer after the fifth wash than it is on day one, the opposite of how cotton tends to age over time. Construction follows the same safe-sleep logic as the rest of the sleep bag line: sleeveless on purpose, so a baby sheds heat instead of trapping it, with a two-way zipper running the length of the bag for a diaper change that takes seconds and wakes nobody. The neck and arm openings are bound in soft fabric rather than scratchy serged edges, cut snug, the detail that matters most for safe sleep. Most premium brands skip this weight entirely; their lightest options typically start at 0.6 or 0.7 TOG and run warmer than the label suggests, leaving warm nurseries choosing between an unsafe loose blanket or no sleep sack at all. A true 0.5 TOG muslin bag solves both problems directly, without asking a parent to compromise on either safety or actual comfort. Sized 0–6M through 18–36M, always size to current weight, not age, since a neck opening that's too wide can ride up over a baby's face overnight. Machine wash cold and tumble dry low; Tanboocel® takes the dryer better than generic bamboo rayon, with less pilling and shrinkage over repeated cycles. Tested to Health Canada's Textile Flammability Regulations, CPSIA, and ASTM standards, and certified to OEKO-TEX Standard 100.
Irresistibly Light & Airy Muslin Fabric
Oeko-Tex Certified & Chemical Free
Non-Toxic & Safe
Ultra-Soft & Gentle On Baby’s Skin
The following chart is for reference only. Please reach out to our customer service team if you have any questions on the sizes.
Sleep Bags
| Size | Height (in) | Weight (lb) |
|---|---|---|
| 0 - 6 M | 23 - 26" | 10 - 16 lbs |
| 6 - 18 M | 26 - 34" | 16 - 26 lbs |
| 18 - 36 M | 34 - 40" | 26 - 40 lbs |
Sleepsuits
| Size | Height (in) | Weight (lb) |
|---|---|---|
| 6 - 18 M | 29 - 31" | 22 - 27 lbs |
| 18 - 36 M | 31 - 34" | 27 - 32 lbs |
| 3T - 4T | 34 - 37" | 32 - 36 lbs |
Why Parents Love This
Quick And Easy Diaper Changes
Unzips from the bottom so you never have to fully undress your baby — even at 3am.
Clever Stay Put Design
Baby can't kick it off, meaning fewer wakeups (for them and for you!)
Breathable All Night
Open-weave muslin keeps air flowing so they don't overheat — even on warm nights.
Gets Softer With Every Wash
Muslin only gets better over time — softer after every cycle, built to last through the whole baby stage.
Quick And Easy Diaper Changes
Unzips from the bottom so you never have to fully undress your baby — even at 3am.
Clever Stay Put Design
Baby can't kick it off, meaning fewer wakeups (for them and for you!)
Breathable All Night
Open-weave muslin keeps air flowing so they don't overheat — even on warm nights.
Gets Softer With Every Wash
Muslin only gets better over time — softer after every cycle, built to last through the whole baby stage.
Machine wash cold with like colours
Tumble dry on low heat
Use only non-chlorine bleach
Do not iron
Do not dry clean
Wash in a garment bag
Get the set
- The muslin material is beautiful — it feels so light, airy, and breathable
- Soft and comfortable and just right for the hot weather
- The zippers are also incredibly smooth and easy to use
I absolutely love these sleep sacks and other LouLou products! The quality is fantastic and has endured many washes!! I aim to not put in dryer— one sack has gone in multiple times while the other I try to hang. I’m so impressed by how well these have stood up over the past 4 months of wear.
A bit disappointed there’s no between size from the 0-6 and 6-18. My daughter is too petite to fit the next size for some time. It will be tough to be without our favourite sleep sack until she can.
I bought this sleepsack today from a local store in my home town that carries the brand and was excited for it for my baby! It’s super soft and I thought it would be great since the weather is getting warmer and my baby tends to run a little warm, however, I gave it a wash when I got it home, followed the recommended care instructions and washed it on delicate and in a garment bag, I even hung it to dry and I’m now seeing that around the brand tag that it’s fraying/ripping.
So cute but significant tearing of the side seam within < 1 month of use. For the cost — not worth it.
I’ve only had this sleep sack for a month and it is the softest muslin, I wish I’d know about these when my toddler was a newborn. Unfortunately after only 3 washes in the machine, there is a large tear on the outer layer on the side seam :(
Would have given it 5 stars, but the sizing seems very small. Our little one is 5 months old, and these will probably only fit him for another month at most :(
Otherwise very good quality, and would buy again in the correct size.
We’ve been having trouble finding my two month old daughter something comfortable to sleep in that doesn’t restrict her arms (which she hates) or overheats her and this sleeper is the answer. It’s also incredibly cute! My favourite detail is the diagonal zipper that doesn’t bunch up under her chin like other sleep sacks do.
My grand daughter sleeps so
Well in these just the right weight
Wash beautifully
I absolutely love this sleep bag! The muslin material is beautiful — it feels so light, airy, and breathable, which makes it perfect for warmer nights or when I don’t want P to feel too bundled up.
The sizing is really generous without feeling oversized, and there’s lots of room for her to move comfortably. The zippers are also incredibly smooth and easy to use, which is something I really appreciate during bedtime and nighttime changes.
Overall, it’s such a beautiful, well-made piece. The fabric, fit, and little details all feel thoughtfully done, and I can already see this being one of the sleep bags we reach for all the time.
I bought one for my daughter and she and her baby love it! Soft and comfortable and just right for the hot weather. I’ve bought two more to give as gifts. They’re perfect.
so cute and soft! did well in the wash
so soft! excited for my son to use this
Soft light weight summer sleep sack
I love your sleep sacks. I have bought many for my grandchildren. My daughters love them.
I love how thin this sleep sack is, because my house currently doesn't have AC, and it's getting hot, this sleep sack works perfectly for my baby's night sleep.
J'adore ce produit ! C'est vraiment une très belle qualité pour nos minis
So soft and lovely. The design is so cute. Can’t wait for baby to enjoy this!
terrible ... my daughter zipped herself out immediately
I bought this as a gift for my soon to be born grandbaby. My daughter loves it, she said it is quilted, but still lightweight. She is very pleased with the quality.
Love this product its cute and functional my baby can sleep comfortably and so i can i knowing i dont have to worry about blankets.
The muslin fabric is fragile & snags easily in the washing machine.
Such a beautiful print and nice soft material. Cant wait to use it in warmer weather!!!
Great quality material that holds up when washed repeatedly. My little lady sleeps great in it. Definitely recommend and is essential for a good nights sleep for baby.
I love everything loulou lollipop. So soft and such good quality
Love the design, and how lightweight it is. Has been great for when our little guy is running a fever or under the weather, but we still want him cozy. Also great for warmer, summer days.
I purchased four of these sleep sacks in different patterns for my twin girls for summertime sleeping. The lightweight material is soft, and kept my girls cozy but comfortable in warm weather. We will definitely be packing these for a warm weather vacation this winter and the generous size means that they will likely still fit next summer too!
Bought two and quality is not the same as before. Material on both has loose threads and pulled. Have ones that are two years older and in better shape. Cute patterns and no problems with the zipper though.
This lightweight sleep sack has been fantastic for warm summer nights, giving me peace of mind that my little one would stay nice and cozy without overheating. Love the double zipper and cute designs. Loulou Lollipop are by far the best quality sleep sacks I have tried so far!
Excellent product! Soft and cozy. Exactly what I was hoping for.