Big O.N.E. Cloth Diaper - Petal

Our best-selling diaper, O.N.E, just got BIGGER and BETTER!  Introducing Big O.N.E., a diaper designed to meet the absorbency and size needs of larger kiddos.

The Big O.N.E diaper unique among cloth diaper all in ones (fits 35-70 pounds) because it comes with everything parents need to cloth diaper a baby: enough absorbency to forget boosters and doublers (even overnight), two built-in closure options, and a heavy-duty construction that is built to last.

The Big O.N.E. features a unique Outlast closure system that gives you the ability to choose between Hook & Loop and Snap closures, and the ability to buy a replacement kit when your Hook & Loop wears out. Big O.N.E's absorbency comes from a hidden body layer PLUS our one-of-a-kind cotton, channeled soaker design that is trim yet absorbent. All with the same amazing quality you've come to know and love in GroVia products. 

No need to choose between Hook & Loop or Snap closures

With the Big O.N.E., you can have both! The removable Hook & Loop closure is perfect for those who love a “no-hassle” fit but want to transition to a snap closure later on. 

  • Built-in extra absorbency means the perfect nighttime solution
  • Lasts from birth to potty learning (fits 35-70 lbs).
  • No prepping - can starting using right away
  • Modular Snap In Soaker System allows for customization
  • Easy closure replacement
  • Fairly and conscientiously made in China



Washing Instructions

This is an All In One diaper, you must wash the entire diaper when soiled.

Before First Use

Remove Hook & Loop strips*. The BIG O.N.E. must be washed and tumble-dried 3-5 times before first use.

Regular Wash

  • Remove Hook and Loop strips*
  • Place soiled diaper into pail
  • Wash soiled diaper every two days
  • Wash on hot or warm with full amount of a good cleaning detergent using a heavy duty cycle
  • Add an extra rinse if needed
  • Tumble dry
  • Do not use fabric softeners or water repellent diaper creams
  • Do not dry clean or iron

*For maximum longevity of your hook and loop, we recommend removing prior to washing and drying.

Use & Materials


  • Hidden Inner Layer: 100% Polyester Microfiber
  • Outer: 100% Water Resistant Polyester TPU
  • Soaker: 100% Cotton topped with 100% Polyester Microfleece
  • Body Lining: 100% Polyester Microfleece
  • Outer: 100% Water Resistant Polyester TPU (Exclusive of Trim)


  • 1 All In One Outer Shell
  • 1 Large Soaker Pad
  • 1 Small Soaker Pad

Customer Reviews

Based on 9 reviews
Kurstyn Vanasse
Wouldn’t go anywhere else!!

We love grovia and won’t get any other diapers! They are so absorbing and trim! They are durable and so cute! We tried a BIG ones thIs time and my very heavy wetter was dry in this overnight! I plan to get more BIG ones as soon as they restock!
Thanks so much!

April Noe
My new favorite!!

As cloth diapering momma whose kiddo is medically complex and will be diapered for a lifetime - this product is a lifesaver! I am a dedicated fitteds and covers user but they just don’t exist for bigger kids. I tried the other company’s pocket style diaper and no matter what I did - I had leaks. The BigONEs have completely solved that issue. The fit is phenomenal and we don’t have leaks! I can use these overnight with a pad folded flat or a prefold to boost absorbency and zero leaks even overnight. I love them so much I have deatashed my very large rotation of pocket style diapers and moved entirely to Big ONEs. Thank you Grovia for serving this special population with an awesome product!

Rachel Jensen
The Big One

I have a 10 year old daughter who is special needs (she has a rare syndrome that affects her physically & mentally on a global level). I’ve been using disposable pulll-ups for years now and for years I’ve had to wash three layers of incontinence bedding every morning and remake her bed every day due to leaks. I thought I would finally try cloth diapers because she is outgrowing the disposables that she’s been using, as she weighs 55 pounds now. This has been life-changing for me. For the first time in years I haven’t had to change her bedding due to leaks. Not once! This diaper is absolutely amazing and I am recommending it to anyone who will listen.