That's an excellent and practical question for anyone managing waste in a city or commercial setting. The short answer is: they are neither fully standardized nor completely brand-specific, but exist in a middle ground with common, de facto standards.
There is no single, universal international standard that all manufacturers follow. However, the market has converged around several common sizes that correspond to popular bin models. For example, liners for a standard 55-gallon (208-liter) wheeled cart are widely available from multiple brands and are generally interchangeable. The same goes for common sizes like 32-gallon, 64-gallon, or 96-gallon cart liners.
Where variation comes in is primarily in:
* Material & Thickness: Brands differ in the plastic polymer used (e.g., low-density vs. high-density polyethylene), thickness (measured in mils or microns), and additives for strength or odor control.
* Precise Dimensions: Even for a "55-gallon" liner, the exact width, length, and gusset style can vary slightly, affecting the fit in a specific bin.
* Specialized Features: Some brands offer drawstring closures, anti-microbial coatings, or colors for recycling/trash separation.
How to Ensure a Proper Fit:
1. Measure Your Bin: The most reliable method. Measure the interior height, perimeter (or length and width), and depth.
2. Check the Manufacturer: If your bin has a brand name (like Toter, Rubbermaid, Simple Human), check their website for recommended liner part numbers. Using their branded liner guarantees a fit.
3. Look for "Fits" Claims: Generic liner packaging will often state "Fits most 55-gallon carts" or similar. These are usually safe bets for common bins.
In summary, while you have flexibility and can often use generic liners, paying attention to your bin's specific measurements and the liner's stated capacity and dimensions is crucial for avoiding tears, poor fit, and wasted money. For unique or proprietary bin models, the brand-specific liner is often the best choice.