Ultimate Guide to Choosing Bamboo Sleep Sacks vs Cotton Sleep Sacks

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On July 30, 2025

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If, like Ava, you’re stuck between choosing a cotton sleep sack or a bamboo one—don’t worry, you’re not alone. Sleep sacks are essential for safe and cozy baby sleep, but when it comes to fabric, we totally get the confusion.

TL;DR?
You can’t go wrong with either. But if you’re after softness, breathability, and eco-friendly peace of mind, bamboo may just win your heart (and your baby’s skin).

At Mini Bamboo PJs, we specialize in bamboo babywear that helps little ones sleep soundly and stay comfy from day to night. So let’s break down the pros and cons of bamboo vs cotton sleep sacks, and help you find the one that fits your family best.

Bamboo Sleep Sacks: Ultra Soft, Naturally Cool

Let’s talk about our favorite: bamboo viscose.

Bamboo sleep sacks are incredibly popular for a reason. They’re buttery soft, cool to the touch, and have natural stretch that moves with your baby. Made from bamboo viscose with just the right amount of spandex, our sleep sacks offer the ideal combination of comfort and flexibility.

Here’s what sets them apart:

Highly breathable — keeps baby from overheating
Moisture-wicking — perfect for drool, sweat, and warm nights
Hypoallergenic — gentle for sensitive or eczema-prone skin
Eco-friendly — bamboo grows fast with less water and no pesticides

Some parents ask us about the chemical process used to turn bamboo into fabric. At Mini Bamboo PJs, we work only with suppliers who meet OEKO-TEX® certification standards, so you can rest easy knowing our bamboo materials are safe, non-toxic, and responsibly made.

✨ Hot tip: Bamboo sleep sacks are especially loved by parents in warmer climates or with babies who tend to run hot at night.

Cotton Sleep Sacks: Classic, Durable & Loved

Cotton, especially GOTS-certified organic cotton, is a classic for a reason. While it doesn’t have that same silky feel or stretch as bamboo, it’s still soft, breathable, and ideal for everyday use.

Organic cotton sleep sacks are:

Naturally breathable and skin-safe
Durable and softens over time
Widely available and often more affordable
GOTS-certified for organic farming and manufacturing practices

However, cotton lacks the same moisture-wicking and thermoregulating powers bamboo has. So if your baby tends to sweat or wake up hot, you may find bamboo does a better job of keeping them comfortable all night.

Design Features: Bamboo and Cotton Sleep Sacks

No matter which fabric you choose, we’ve made sure all our sleep sacks are packed with thoughtful features:

✅ Dual zippers for easy midnight diaper changes
✅ Zipper covers for extra safety
✅ Removable sleeves to adjust to seasons and room temp
✅ Available in multiple sizes from newborn to toddler
✅ Footed options and swaddle-style options for every stage

Whether you’re dressing a 2-week-old or a 2-year-old, our bamboo sleep sacks come in seasonal styles and prints to match your baby’s unique personality.

What About TOG Ratings?

TOG (Thermal Overall Grade) is how we measure the warmth of our sleep sacks. All Mini Bamboo PJs sleep sacks are TOG-rated, so you’ll know exactly how warm they’ll be—no more second-guessing.

Our standard 1.0 TOG bamboo sleep sack is perfect for room temps between 68–75°F (20–24°C). The removable sleeves let you adjust as needed for layering or season changes.

💤 Need something warmer or cooler? Keep an eye on our seasonal releases—we’ve got you covered.

So… Bamboo or Cotton?

In the end, it’s all about what you and your baby prefer. If you’re after softness, stretch, and a cooler feel—go with bamboo. If you love the feel of classic cotton, especially with an organic label—go cotton. There’s no wrong answer!

But if you’ve never tried bamboo sleepwear before, we’d say: try it once and you might never go back.

Explore Our Bamboo Sleep Sack Collection

At Mini Bamboo PJs, we believe that safety, comfort, and sustainability should be standard in every baby product. That’s why we only use high-quality, OEKO-TEX® certified bamboo fabrics and design every sleep sack with your baby’s needs in mind.

🛒 Shop our latest prints, solids, and sleep sack styles—from swaddle sacks to footed bags and everything in between. Sizes available for 0–6M, 6–18M, and 18–36M.