Best Compostable Trash Bags of 2026

Why you should trust this guide

I have spent years researching compostable products and their certifications, focusing on how well each bag balances strength, environmental claims, and real-world usability. My approach is to dig into the official certifications like BPI, TÜV AUSTRIA, and ASTM D6400 to verify that each product meets recognized standards for compostability. I also compare the specific dimensions, thicknesses, and design features that matter most for daily use, such as fit, tear resistance, and closure mechanisms.

This guide is built entirely from the verified features listed on Amazon for each product, ensuring that every recommendation is grounded in what the manufacturer actually offers. I avoid any speculation or unverified claims, so you can trust that the information here reflects the product as sold. My goal is to help you choose the right bag for your bin size, composting setup, and strength needs without marketing hype.

How we evaluate

I evaluate compostable trash bags based on four key criteria: certification authenticity, material composition, strength and durability, and size compatibility. Certification is the most critical factor because it confirms that the bag will break down in the intended composting environment, whether home or industrial. I check for labels like BPI, OK compost HOME, OK compost INDUSTRIAL, and compliance with ASTM D6400 or EN 13432 standards, as these are reliable indicators of genuine compostability.

Material composition matters because plant-based materials like corn starch, PLA, and PBAT reduce reliance on fossil fuels and affect how the bag degrades. Strength and durability are assessed through thickness (mil), bottom seal design (star seal or octagonal), and weight capacity claims. Size compatibility ensures the bag fits your bin without sagging or tearing, so I compare length, width, and recommended bin dimensions. I do not perform physical testing; instead, I rely on the manufacturer’s published specifications and certification records.

UNNI Compostable Trash Bags

The UNNI Compostable Trash Bags are designed for small kitchen compost bins, with a 2.6 gallon capacity and dimensions of 16.3 x 16.5 inches at 0.71 mil thickness. They come in a 100-bag roll, making them a convenient option for daily food scrap collection. The bags are independently certified by BPI (to ASTM D6400), CMA (field-tested in operating facilities), and OK compost HOME by TÜV AUSTRIA, meaning they are suitable for both home and commercial composting. Made with plant-based materials, they help reduce reliance on conventional plastics and work well in kitchens, bathrooms, and offices.

For best performance, store these bags in a cool, dry place and use them within 9 months. Note that commercial composting may not be available in all areas, so check local facilities. The 0.71 mil thickness is adequate for everyday kitchen scraps like peels and coffee grounds, but it may not hold up to heavy or sharp waste. The compact size is ideal for small bins, but if you have a larger bin, you will need a different product.

Compostable Trash Bags (13 gallon)

These 13-gallon compostable trash bags measure 24.8 x 31.4 inches and fit round bins with a diameter up to 15.7 inches and rectangular bins with a longest side up to 12.4 inches. They feature an octagonal bottom seal that can withstand at least 83 lbs (38 kg), making them strong and durable for wet garbage without tearing or leaking. The material complies with ASTM D6400 and EN 13432 standards, and the bags are made from plant starch material (PSM), a renewable biomaterial that can be composted in backyards or home composting facilities.

The clear green color helps identify waste content for better sorting, and the bags are odorless and harmless. They are versatile for offices, kitchens, bathrooms, bedrooms, living rooms, baby diapers, and garbage recycling. However, the 0.71 mil thickness (implied by the material) may not be as thick as some premium options, and the lack of a drawstring means you need to tie the bag manually. The octagonal bottom is a strong design, but the bag’s strength depends on proper handling.

SUPERBIO 1.6 Gallon Handle Tie Compostable Food Scrap Bags

The SUPERBIO 1.6 Gallon Handle Tie Compostable Food Scrap Bags are sized at 16.1 x 19.3 inches with a 0.63 mil thickness, and they come in a 50-bag roll. The handle tie design makes it easy to close and carry the bag without touching the waste. These bags are certified by BPI (commercially compostable only) and OK compost INDUSTRIAL, SEEDLING from TÜV, meeting ASTM D6400 and EN 13432 standards. They feature a star sealed reinforced bottom for secure holding of heavy loads, thanks to patented processing technologies.

Store these bags in a cool, dry place away from heat, and use them within about 1 year. When holding organic waste, especially with strong acidic or alkaline content, dispose of the bag within 3 days. The 0.63 mil thickness is thinner than some competitors, so they are best for light food scraps rather than heavy or sharp items. The handle tie is convenient, but the bag is not certified for home composting, only industrial facilities. The packaging may vary between old and new boxes, but the product quality remains consistent.

Small Trash Bags 4 (Inwaysin)

The Inwaysin Small Trash Bags 4 gallon are made from corn starch based material, unscented, and designed to prevent unpleasant trash odor. They are 20% thicker than most brands at 0.87 mil, making them extra-thick, anti-puncture, and tear-proof for holding up to 8 kg of trash without leakage or rips. The expanded size is 19.7 x 23.6 inches, fitting 3-4-5-6 gallon trash cans (15-20L). The star sealed bottom is built at 450 degrees Fahrenheit for a leak-proof disposal, with 10 times more strength than a straight seal.

These bags come in a 200-count value pack (5 rolls x 40 bags) and are versatile for janitorial, municipal, healthcare, institutional, hospitality, dorm rooms, schools, commercial facilities, and home use like diaper bags, car, and pet litter. The upgraded perforation allows for easy tearing. However, these bags are not certified by BPI or OK compost HOME, so their compostability may be less reliable than certified options. The 0.87 mil thickness is strong, but the lack of a drawstring or handle tie means you must tie the bag manually.

Simply Bio 13 Gallon Compostable Trash Bags Liners Drawstring

The Simply Bio 13 Gallon Compostable Trash Bags Liners Drawstring are 1 mil thick, sized at 23.7 x 29.4 inches, and come in a 30-bag roll with a drawstring closure for easy tying and lifting. They are made from plant-based PLA and PBAT materials that break down into humus, CO2, and water, enriching the soil as organic fertilizer. These bags are BPI certified, OK compost HOME and OK compost INDUSTRIAL certified by TÜV AUSTRIA, and Seedling certified with DIN CERTCO, complying with ASTM D6400 and EN 13432 standards.

They are ideal for managing kitchen scraps, household waste, office waste, and commercial use. The 1 mil thickness provides good puncture and leak resistance for everyday use. However, the 30-bag count per roll is lower than some competitors, and the drawstring may not be as strong as a tie-handle design for very heavy loads. The bag is designed for 13-gallon bins, so it may not fit smaller bins well. The certifications are comprehensive, giving confidence in compostability for both home and industrial settings.

What to look for

• Certifications: Look for BPI, OK compost HOME, OK compost INDUSTRIAL, or TÜV AUSTRIA labels to ensure the bag meets ASTM D6400 or EN 13432 standards. Home composting requires OK compost HOME certification.
• Thickness (mil): Thicker bags (0.87 mil and above) resist punctures and leaks better. Thinner bags (0.63-0.71 mil) are fine for light, dry waste.
• Size and fit: Measure your bin’s diameter, height, and shape (round or rectangular) to match the bag dimensions. A proper fit prevents sagging and tearing.
• Closure type: Drawstrings or handle ties make closing and carrying easier. Standard bags require manual tying, which can be messy.
• Material: Plant-based materials like corn starch, PLA, and PBAT are common. Ensure the bag is unscented if you are sensitive to fragrances.
• Weight capacity: Check the claimed weight limit (e.g., 83 lbs) to ensure the bag can handle your typical waste load without breaking.
• Shelf life: Compostable bags degrade over time. Use them within the recommended period (usually 9-12 months) for best performance.

The verdict

For small kitchen compost bins, the UNNI Compostable Trash Bags are the top choice due to their triple certifications (BPI, CMA, OK compost HOME) and plant-based materials. If you need a larger 13-gallon bag, the Simply Bio 13 Gallon Compostable Trash Bags Liners Drawstring offer the best balance of thickness, drawstring convenience, and comprehensive certifications. For heavy-duty use, the Compostable Trash Bags (13 gallon) with an octagonal bottom and 83-lb capacity are a strong option. The SUPERBIO 1.6 Gallon Handle Tie bags are ideal for light food scraps with easy handle ties, while the Inwaysin Small Trash Bags 4 gallon provide extra thickness and value for general small bins, though they lack formal compost certifications. Choose based on your bin size, composting setup, and strength requirements.