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Baby Muslin Sleep Bag 0.5 TOG in Tanboocel® Bamboo Viscose - Mini Mathletes
Buy Any 3 & Save 10%
Two-Way Zipper
Machine Washable & Dryer Safe
Breathable & Soft
OEKO-TEX Certified, Chemical-Free
As Featured In
Description
Visiting family in a warmer climate, the 0.5 TOG is the bag that gets packed first.
Alligators on swings, elephants, kites, hopscotch — playground math.
This is the lightest sleep bag we make, rated for nursery temperatures between 24 and 27°C — summer nights, top-floor bedrooms, and the many Canadian homes that were never built with 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. Cream ground with alligators on swings and seesaws, small elephants and pink bunnies, kites being flown by our Wolfie, hopscotch grids, balloons, small numbers, clouds, and 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 warm nurseries choosing between a blanket, which the Canadian Paediatric Society 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 Mini Mathletes is built for the everyday 21–24°C nursery. The 2.5 TOG winter weight picks up below 20°C.
Sizing. 0–6M (fits 3.6–8.2 kg / 8–18 lb), 6–18M (fits 8.2–12.7 kg / 18–28 lb), 18–36M (fits 12.7–17.2 kg / 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. Tested to Health Canada's Textile Flammability Regulations, and to CPSIA and ASTM standards. The material is certified to OEKO-TEX Standard 100, and Loulou Lollipop is a Certified B Corporation.
Common questions
What temperature is 0.5 TOG good for?
0.5 TOG is the warm-room weight. Use it when the nursery sits between 24 and 27°C, typically summer nights, top-floor bedrooms, or homes without central AC. Pair with a short-sleeve bodysuit underneath.
Is muslin better than fleece for baby sleep?
Muslin breathes. Fleece traps heat. For warm-weather sleep, muslin moves humidity off the baby's skin and keeps temperature stable. Fleece sleep sacks are designed for cold nurseries and shouldn't be the default in summer.
Are baby sleep sacks safe for newborns?
Yes — once the baby is out of the swaddle phase and can roll. Health Canada notes that many parents use a sleep sack instead of a blanket, and is explicit that getting the size right is what makes it safe. Choose the correct TOG for room temperature and a size that fits at the shoulders so the bag can't slip over the face.
Free shipping across Canada over $100. Loulou Lollipop is Canadian owned and designed in Vancouver. Free 30-day returns on unworn items in original packaging.
Part of the Big Dreams Sleep System. Sleepers and sleep bags in Mini Mathletes are built to layer together through the night — same print, one system. Complete the set with the TENCEL™ 1.0 TOG Sleep Bag and TENCEL™ Sleeper.
Why We Love It
The Details
Shipping & Returns
We ship every order from right here in Canada. Orders over $100 CAD ship free within Canada; smaller orders are a flat $12 (BC) or $15 (rest of Canada), with most arriving in 5–10 business days. We also ship internationally with tracking included — duties and taxes are calculated at checkout and are the recipient's responsibility.
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.
Size guide
Muslin Sleep Bag 0.5 TOG
Our lightweight bag for warm rooms and summer nights.
| Size | Height | Weight |
|---|---|---|
| 0-6 M | 58–66 cm23–26 in | 4.5–7.3 kg10–16 lb |
| 6-18 M | 66–86 cm26–34 in | 7.3–11.8 kg16–26 lb |
| 18-36 M | 86–102 cm34–40 in | 11.8–18.1 kg26–40 lb |
How it should fit
- Choose by height and weight, not the age on the label.
- The neck and armholes should sit snugly. A neck opening that's too wide can ride up over your baby's face during the night.
- Between sizes? Check the neck and armholes. If the bigger size is loose there, stay in the smaller one.
How to measure
- Height. Lay your child flat and measure from the top of the head to the heel.
- Weight. Use their most recent weight from a check-up or home scale.
Still not sure? Ask us and we'll help you pick a size.
Our Safety Standards
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.
Soft and thin enough for hot nights, but transitions well to fall weather with some pj’s underneath. I’ve been using this brand since our first sleep sack and have just sized up to 18-36 months and I’m still obsessed! Can’t recommend enough.
Thanks so much for your lovely review! We are thrilled the Magical Dragons Sleep Bag keeps your little one comfortable through warm summer nights and cooler fall weather. It means so much that you have trusted us since your first sleep sack—thank you for growing with us!
Love these sleep sacks!! They’re so soft and last so long between sizes. I’ve tried other brands but this is by far my favourite!
We are truly grateful for your honest feedback and are delighted to know that your little one enjoys the softness of our sleep bags. Even better that the sizing/fit between sizes allow them to be used for even longer. It means so much to us to be your favourite!
All Good
The fabric is so soft and gentle that I feel comfortable letting my daughter sleep on it.
Safety & comfort are our absolute top priorities. We are delighted that your little one is enjoying our signature Tencel sleep bag to the fullest. Thank you!
light and super soft sleeping bag. perfect for warm days
We are over the moon to hear that the muslin sleep bag feels light is perfect for warm days & warmer room environments. Happy snoozing!
Just bought a second one! This is my second sleep bag from Louloulollipop and I love it just as much as the first! Highly recommend.
Thanks so much for coming back for a second sleep bag! We’re thrilled you love it just as much as the first and really appreciate your recommendation.
So cozy! Bought this for my LO and he loves it. It’s super soft and provides just the right amount of warmth.
We are genuinely so happy your little one loves the sleep bag and finds it soft and cozy. Wishing you both many snuggly nights!
This was such a great item for summer heat. It’s light and airy with no stress of baby being too warm. Will definitely be buying in our size up for next summer season!
It is so wonderful to hear that our sleep bag has kept your little one comfortable through the summer heat. We would love to help with the next size when summer rolls around!
All of Lou Lou lollipops products are phenomenal! Such great quality, fun prints and thoughtful designs of clothing to make changing easier and sleep safer. Highly recommend anything from their store! Such a great company as well, donating gifts to new families and supporting mamas for mamas with the BC wildfire relief.
Thank you so much for this incredibly kind review! We are so happy to hear that you love the quality, fun prints, and thoughtful details across our products. It means so much to know that our designs are making everyday moments a little easier for families.
And thank you for recognizing our community initiatives as well. Supporting families and giving back, especially during challenging times, is something that is very close to our hearts. We are truly grateful for your support of Loulou Lollipop!
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!
FAQs
What temperature is 0.5 TOG good for?
Is muslin better than fleece for baby sleep?
Are baby sleep sacks safe for newborns?
Designed in Canada
Loulou Lollipop launched in Vancouver in 2014 with one swaddle and one teether.