Product highlights
Material
Sustainability
Lifecycle
Purpose
Room
Soak Sponge
Biodegradable cellulose dish sponges that ship flat and pop up the moment they hit water.
Product highlights
Material
Sustainability
Lifecycle
Purpose
Room
White
3 Sponges
Overview
A sponge that ships flat and pops up when it's wet. Plastno's biodegradable cellulose sponge arrives about a fifth the size of a regular foam sponge, then expands under water into a soft, thirsty sponge for dishes and counters. All plant fiber, no plastic foam, so it wipes up messes without leaving microplastic behind.
- Just add water: Ships flat and compact, then pops up to full size the moment it gets wet. Comes in a 3-pack.
- Plant-based and plastic-free: Made from 100% cellulose, biodegradable, with no foam fillers or synthetic coatings.
- Easy to sanitize: Boil it or run it through the dishwasher about once a week.
Ingredients
Made with plant-based cellulose.
Use
1. Clean. Tackle dishes, counters, and most hard surfaces with a plant-based sponge that holds up to daily use.
2. Sanitize. Boil it or run it through the dishwasher (top rack) between uses to keep it fresh.
Details
| Specification | Soak Sponge |
|---|---|
| Shape | Square |
| Dimensions | 3.75" W x 3.75" H |
| Thickness expanded | 0.5" |
| Thickness as shipped | 0.20". About 1/5 the size of a standard foam sponge |
| Sponges per pack | 3 |
| Weight | About 0.016 lb per sponge |
| Material | Cellulose. Single layer, no loofah scrub side |
| Expands | On contact with water |
| Stated lifespan | 2 to 4 months per sponge with proper care |
| Sanitizing | Top rack of the dishwasher on a hot cycle, or boil 1 to 2 minutes |
| Shelf life | None. Stable indefinitely when stored dry |
| Biodegradable | Yes. Plant-derived cellulose |
| Compostable | Breaks down in a home compost pile or buried in soil. Not third-party certified |
| Plastic scouring layer | None. No nylon or polyester mesh anywhere on the sponge |
| Contains no | Polyurethane, polyester, nylon, polypropylene, PET, foam filler, plastic scrubber, synthetic coating, added fragrance, synthetic dye |
| Packaging | Kraft plastic-free paper wrapper, kraft cardboard box or mailer |
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Soak Sponge
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Shipping Information
Fulfilled within 1-2 business days and packaged in our minimal, fully recyclable signature boxes.
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The biodegradable cellulose sponge that ships flat and pops up
A sponge that ships flat and pops up the second it gets wet. Under the tap it opens into a soft, thirsty cellulose sponge for dishes, counters, and spills, and it is all plant fiber instead of plastic foam. It wipes up messes without shedding microplastic, and it lasts months before it biodegrades.
How it works
1. Grab. Take a flat sponge from the pack and run it under warm water. It pops up to full size in seconds.
2. Scrub. Wipe dishes, counters, or most hard surfaces. Cellulose is gentle on hands and finishes.
3. Rinse. Rinse well and air-dry between uses so it lasts longer.
Plant-based ingredients
Cellulose comes from plant fibers and biodegrades naturally when buried in soil or added to a backyard compost pile. It absorbs water like a regular sponge, handles daily kitchen use, and breaks down without shedding microplastics into waterways the way foam does.
Why switch to a biodegradable cellulose sponge
A single foam sponge sheds microplastics into your sink and your food every time you wash. Multiply that by every kitchen, every week, every year. Plant-based cellulose gives you the same absorbency, a longer life, and none of the petroleum.
What you won't find in Plastno
Human safe
Every Plastno product is made with plant and mineral based ingredients, free from the petroleum-based plastics, synthetic foams, added fragrances, and harsh chemicals found in conventional cleaning supplies. Safer for your home, safer for the people in it.
✗ Microplastic shedding
✗ Synthetic foams
✗ Petroleum-based plastics
✗ Added fragrances
✗ Harsh chemicals
✗ Synthetic dyes
✗ Antimicrobial coatings
Less plastic
From the product to the packaging, every Plastno purchase keeps single-use plastic out of your home and out of waterways. Packaging is intentionally minimal, just a clean paper wrapper and a curbside-recyclable cardboard box. No clamshells, no shrink wrap, no fancy inserts that add waste in the name of looking premium.
✓ Intentionally minimal packaging
✓ Plastic-free, recyclable paper wrapper
✓ Curbside-recyclable shipping box
✓ Paper-based tape
✓ Water-based inks
✓ No clamshells, shrink wrap, or extra inserts
Scrub Sponge vs Soak Sponge
Not sure which to pick? Here's how they differ.
Plastno
Scrub Sponge
Plastno
Soak Sponge
Plastno
Scrub Sponge
Plastno
Soak SpongeBest for
Stuck-on food, pans, cast iron
Best for
Everyday dishes, glassware, non-stick
Texture
Dual-action loofah and cellulose
Texture
Soft cellulose
Safe on non-stick and glass
Safe on non-stick and glass
Material
Loofah and cellulose
Material
100% cellulose
Ships flat, pops up in water
Ships flat, pops up in water
Dishwasher safe and boilable
Dishwasher safe and boilable
Before you ditch your plastic sponge
Do kitchen sponges shed microplastics?
Yes. A 2026 University of Bonn study measured what kitchen sponges shed. It found 0.68 to 4.21 grams of microplastics per person per year, depending on the sponge, and that sponges with less plastic shed far less. Plastno's biodegradable cellulose sponge has no plastic in it to shed. We compared seven plant-based sponges on that exact question. Here is what our sponges are made of.
How long do Plastno Soak Sponges last?
Each sponge lasts 2 to 4 months with daily use. To get the full life out of it, rinse it thoroughly after each use, wring it out, and let it air-dry. Boil it or run it through the dishwasher once a week to keep it fresh.
How should I care for Plastno Soak Sponges?
Boil it or run it through the dishwasher on the top rack to sanitize. When it wears out, the sponge is biodegradable. It is one layer of plant-based cellulose, so the whole sponge breaks down in a home compost pile. Not third-party certified. Bury it in soil and it leaves no plastic residue.
Is the Soak Sponge plastic-free?
Yes. The sponge itself is 100% plant-derived cellulose, with no polyurethane foam, no polyester, and no antimicrobial coatings. The 3-pack comes wrapped in kraft paper inside a kraft cardboard box you can put in your curbside recycling, with paper-based tape and water-based inks.
How is the Soak Sponge different from the Scrub Sponge?
The Soak Sponge is the soft, ultra-absorbent option for daily dish-washing, counters, and spills. The Scrub Sponge adds a firm loofah side for cookware and stuck-on grease. Many shoppers keep both on hand for a full plastic-free kitchen setup.