Look at the bottom of a plastic water bottle or food container, and you may see a number from 1 to 7 inside a triangle. These numbers are often called “recycling numbers,” but that description can be misleading.
The numbers are actually Resin Identification Codes (RICs). They identify the general type of plastic resin used to make an item. They do not, by themselves, tell you whether the product is safe or unsafe, whether it contains BPA, whether it can be microwaved, or whether your local recycling program accepts it.
Quick guide: #1 is PET, #2 HDPE, #3 PVC, #4 LDPE, #5 polypropylene, #6 polystyrene, and #7 is a broad “Other” category. For water bottles and food containers, pay attention not only to the number but also to the product's intended use, condition, manufacturer instructions, temperature exposure, and local recycling rules.
This guide explains what plastic numbers 1 through 7 mean, where each resin is commonly used, and how to make more practical choices about water bottles, food containers, reuse, heat, and recycling.
What Do the Numbers on Plastic Bottles Mean?
The number molded into many plastic products identifies the primary plastic resin used to manufacture the item.
The modern Resin Identification Code system includes seven categories:
- #1: Polyethylene terephthalate (PET or PETE)
- #2: High-density polyethylene (HDPE)
- #3: Polyvinyl chloride (PVC)
- #4: Low-density polyethylene (LDPE)
- #5: Polypropylene (PP)
- #6: Polystyrene (PS)
- #7: Other plastics that do not fit categories 1–6
The symbol is useful for sorting and identifying plastics, but it is important not to read more into it than it actually conveys.
A plastic number is not a safety rating. A #1 is not automatically “safer” than a #5, and a #7 is not automatically unsafe. The code identifies the resin category—not the product's complete chemical formulation or every additive that may have been used.
Does the Number Mean the Plastic Is Recyclable?
Not necessarily.
The triangular Resin Identification Code looks similar to the familiar recycling symbol, which is one reason people often assume that any numbered plastic belongs in a curbside recycling bin.
In reality, recycling programs differ significantly by location. Whether an item can be recycled depends on factors such as:
- The resin type
- The shape and size of the item
- Whether it is rigid plastic, film, or foam
- Local sorting equipment
- Available recycling markets
- Your city or waste provider's collection rules
Always check your local recycling guidelines instead of assuming that a number inside a triangle means the item belongs in your recycling bin.
Plastic Numbers 1–7 at a Glance
| Code | Plastic | Common Uses | Practical Consideration |
|---|---|---|---|
| #1 | PET / PETE | Water bottles, soda bottles, beverage and food packaging | Common single-use beverage packaging; recycling acceptance is often relatively broad |
| #2 | HDPE | Milk jugs, detergent bottles, some food containers | Durable resin used in many household and food-contact products |
| #3 | PVC | Pipes, building products, some packaging | Applications and formulations vary considerably |
| #4 | LDPE | Bags, films, wraps, squeezable bottles | Flexible plastic; films often require separate recycling programs |
| #5 | Polypropylene | Food containers, yogurt cups, caps, reusable containers | Frequently used in food-contact applications |
| #6 | Polystyrene | Rigid containers, foam cups, trays, protective packaging | Recycling options may be limited, especially for foam products |
| #7 | Other | Polycarbonate, certain bioplastics, multilayer and other resins | A broad category; the number alone tells you relatively little about the exact material |
Plastic #1: PET or PETE
#1 Polyethylene Terephthalate
PET is one of the most familiar plastics because it is widely used for bottled water, soda, juice, sports drinks, condiments, and other packaged foods and beverages.
It is transparent, lightweight, strong for its weight, and well suited to disposable beverage packaging.
Common examples include:
- Single-use bottled water
- Soda bottles
- Juice bottles
- Sports drink bottles
- Some food jars and containers
A PET water bottle should generally be used according to its intended purpose. Reusing a bottle briefly is different from treating thin disposable packaging as a permanent reusable water bottle.
Repeated use can make disposable bottles scratched, difficult to clean, or physically damaged. If a bottle becomes cracked, badly scratched, deformed, or difficult to clean, replace it.
Plastic #2: HDPE
#2 High-Density Polyethylene
HDPE is a durable, relatively rigid plastic used in a wide range of consumer products.
Common examples include:
- Milk jugs
- Juice containers
- Some reusable bottles
- Detergent containers
- Shampoo bottles
- Some food-storage products
HDPE's chemical resistance and durability make it useful for both food and non-food packaging. However, the fact that an object is made from HDPE does not automatically mean it was manufactured for food contact.
If using HDPE for drinking water or food, use a container specifically manufactured for that purpose.
Plastic #3: PVC
#3 Polyvinyl Chloride
PVC is a versatile resin used extensively in construction, plumbing, flooring, electrical applications, medical products, and some packaging.
Common examples include:
- Pipes
- Vinyl flooring
- Wire and cable coverings
- Shower curtains
- Some packaging
PVC formulations can vary considerably because different products may contain different additives to produce characteristics such as flexibility, rigidity, color, or durability.
Rather than treating every #3 product as universally “safe” or “unsafe,” use products according to their intended purpose. A PVC plumbing component, for example, is a very different product from flexible vinyl packaging.
Plastic #4: LDPE
#4 Low-Density Polyethylene
LDPE is softer and more flexible than HDPE. It is commonly used when manufacturers need films, bags, flexible packaging, or squeezable containers.
Common examples include:
- Plastic bags
- Bread bags
- Plastic films and wraps
- Squeezable bottles
- Some reusable drinking containers
One practical recycling issue with #4 plastic is that flexible films and bags may not belong in ordinary curbside recycling even when rigid LDPE containers are accepted.
Plastic bags and films can interfere with some recycling-sorting equipment, so many communities direct residents to separate-store, drop-off, or specialty collection programs.
Plastic #5: Polypropylene
#5 Polypropylene
Polypropylene, commonly abbreviated as PP, is widely used for food containers and other products where durability and heat resistance are important.
Common examples include:
- Yogurt containers
- Food-storage containers
- Bottle caps
- Some reusable water bottles
- Medicine bottles
- Some takeout containers
Because PP is used in many food-contact products, consumers may encounter containers labeled for microwave or dishwasher use.
Follow the instructions for the specific container. The resin number alone does not tell you whether a particular item is microwave-safe, dishwasher-safe, freezer-safe, or suitable for hot liquids.
Plastic #6: Polystyrene
#6 Polystyrene
Polystyrene can be manufactured as a rigid plastic or expanded into lightweight foam.
Common examples include:
- Foam cups
- Takeout containers
- Foam food trays
- Protective packaging
- Some disposable food-service products
A major practical drawback is end-of-life management. Expanded polystyrene is bulky relative to its weight and is not accepted by many curbside recycling programs.
Where reusable alternatives are practical, they can reduce the number of disposable foam containers entering the waste stream.
Plastic #7: Other
#7 Other Plastics
Code #7 is the category most likely to be misunderstood.
It does not identify one specific plastic. Instead, it covers plastics that do not fit within resin categories #1 through #6.
Depending on the product, #7 can include:
- Polycarbonate
- Some bioplastics such as PLA
- Multilayer materials
- Other specialty resins
This means you cannot look at a #7 code alone and determine the exact characteristics of the product.
Does #7 Mean the Product Contains BPA?
No.
Some polycarbonate products fall into resin category #7, and BPA historically has been associated with certain polycarbonate materials. But #7 does not mean “contains BPA.”
Because #7 is a catch-all category, many #7 products are made from completely different materials.
If BPA is a specific concern, look at the manufacturer's material information rather than using resin code #7 as a shortcut.
Which Plastic Number Is Best for a Water Bottle?
There isn't a single plastic number that can be declared the “best” for every water-bottle application.
The better question is whether the bottle was designed to be reusable and whether you are using it according to the manufacturer's instructions.
For example:
- #1 PET is extremely common for commercially bottled water and other single-use beverages.
- #2 HDPE can be used to make durable, food-grade bottles and containers.
- #4 LDPE is used in certain squeezable, reusable drinking containers.
- #5 polypropylene is used in many reusable food and beverage products.
- #7 requires more information because it represents many different materials.
For a reusable bottle, look beyond the number. Check whether the manufacturer designed the product for repeated drinking-water use, whether it can handle the temperatures you intend to use, how it should be cleaned, and when it should be replaced.
Are Plastic Water Bottles Safe to Reuse?
There is a meaningful difference between a reusable plastic bottle and a thin disposable bottle that is refillable.
A purpose-built reusable bottle is designed around repeated filling, washing, opening, closing, and handling. A disposable bottled-water container generally is not designed for the same service life.
If you occasionally refill a disposable bottle, practical concerns include its physical condition and cleanliness. Narrow bottle openings can make thorough cleaning difficult, and repeated handling can introduce microorganisms from hands and the mouth.
For frequent use, a reusable bottle is generally the more practical choice.
What About Plastic Bottles Left in a Hot Car?
Temperature can affect interactions between food or water and its packaging. Research on PET bottles, for example, has examined how storage time and elevated temperature can influence migration of certain substances from packaging into water.
This does not mean that a bottle becomes suddenly “toxic” when it gets warm. It does provide a sensible reason to store packaged water as intended and to avoid unnecessarily leaving plastic beverage containers in unusually hot conditions for extended periods.
Heat can also physically deform some containers and caps.
If bottled water or a reusable bottle has been stored under conditions inconsistent with the manufacturer's recommendations—or the container has become visibly damaged or distorted—replacing it is a reasonable choice.
Does “BPA-Free” Mean a Plastic Is Completely Risk-Free?
No product label can reduce the characteristics of an entire material to a single ingredient.
“BPA-free” tells you that BPA is not intentionally used in the product in the way addressed by that claim. It does not tell you every detail about the resin, additives, manufacturing process, temperature limits, or intended use.
Likewise, a resin identification code does not provide a complete chemical analysis of the product.
The most useful approach is to buy food and beverage containers from reputable manufacturers and use them under the conditions for which they were designed.
Microplastics and Plastic Water Bottles
Microplastics and nanoplastics have become an active area of scientific research, including research involving bottled water, food packaging, environmental exposure, and food.
The presence of microscopic plastic particles does not demonstrate that a particular exposure level causes a specific health effect. Research continues into exposure, measurement methods, particle size, and possible health implications.
For consumers who simply want to reduce their use of disposable plastic, reusable glass or stainless-steel bottles are straightforward alternatives.
7 Practical Tips for Using Plastic Food and Water Containers
Which Materials Are Good Alternatives to Plastic Water Bottles?
If your goal is to reduce disposable plastic use rather than eliminate every plastic item in your life, there are several reusable options available.
Stainless Steel
Stainless-steel bottles are durable, resistant to breakage, and widely available in insulated and non-insulated designs. They are particularly practical for school, work, sports, and travel.
Glass
Glass does not impart a plastic taste and is easy to inspect and clean. Its primary disadvantages are weight and breakability.
Purpose-Built Reusable Plastic
A good reusable plastic bottle can still be a practical choice. It is lightweight and less breakable than glass. Choose a product intended for repeated beverage use and follow its care instructions.
Plastic Bottles, Recycling and Waste
One of the clearest reasons to reduce disposable water-bottle consumption is waste reduction.
Plastic packaging that is not reused or successfully recycled must ultimately be managed through disposal or other waste-management routes. Plastic that escapes collection can also enter streets, waterways, beaches, and natural environments.
Simple ways to reduce disposable bottle use include:
- Carrying a reusable bottle
- Refilling drinking water at home
- Using public refill stations where appropriate
- Buying fewer individual single-use bottles
- Recycling accepted bottles correctly
- Checking local rules rather than “wish-cycling” unsupported materials
Can Home Water Filtration Reduce Bottled-Water Use?
For households that buy bottled water mainly because they prefer its taste or want to address particular concerns about their tap water, home filtration may reduce the need for single-use bottles.
There are several approaches, including:
- Pitcher filters
- Faucet-mounted filters
- Countertop filters
- Gravity-fed filters
- Under-sink carbon systems
- Reverse osmosis
The right choice depends on the source water and what you want the filtration system to accomplish. Our guide to drinking water filtration systems compares the major technologies and their differences.
Berkey systems are one example of a countertop gravity-fed configuration. They do not require permanent plumbing or electricity. If you're comparing capacities and configurations, see our Berkey Water Filter Systems comparison guide.
Because filtration performance depends on the specific filter element being used, you can also review our water filter test results before choosing an option.
FAQ: Plastic Numbers on Water Bottles
What do the numbers on plastic water bottles mean?
The numbers 1 through 7 are Resin Identification Codes. They identify the general type of plastic resin used to make the product.
Are plastic numbers recycling codes?
They are commonly called recycling numbers, but technically they identify resin types. A number does not guarantee that the item is recyclable in your community.
Which number is used for most disposable water bottles?
Most common single-use clear water bottles are made from #1 PET (PETE), although packaging can vary.
Which plastic numbers are commonly used for reusable bottles?
Reusable plastic beverage containers can be made from several resins, including HDPE, LDPE, polypropylene, and #7 plastics. The product's intended use is more informative than the number alone.
Does plastic #7 always contain BPA?
No. #7 is a broad “Other” category that includes several types of plastic. Some polycarbonate materials fall under #7, but many #7 products are made from other resins.
Does BPA-free mean the bottle is completely safe under any condition?
No single label describes every characteristic of a container. Use food and beverage products according to their intended temperature, cleaning, storage, and reuse instructions.
Can I put any #5 polypropylene container in the microwave?
No. Although polypropylene is used in many heat-tolerant food containers, the resin number does not guarantee that a particular product was designed for microwave use. Follow the manufacturer's labeling.
Should I reuse disposable PET water bottles?
Occasional refilling is different from long-term reuse. Thin disposable bottles are not designed as permanent reusable containers and may become damaged or difficult to clean. For routine refilling, a bottle specifically designed for repeated use is more practical.
Final Thoughts: What Plastic Numbers Really Tell You
Plastic numbers are useful—but only if you understand what they actually mean.
Numbers 1 through 7 identify resin categories. They are not a ranking of plastics from safest to most dangerous, and they do not guarantee recyclability.
For drinking water, the most useful questions are whether a container is designed for beverage use, whether it is intended for reuse, how it should be cleaned, what temperatures it can handle, and whether it remains in good physical condition.
If you want to reduce single-use plastic, you don't need to eliminate every plastic object from your life. A durable, reusable bottle—whether stainless steel, glass, or purpose-built reusable plastic—combined with convenient access to drinking water at home can substantially reduce the number of disposable bottles a household uses.