The little chasing-arrows triangle on a package doesn’t mean much. It’s a resin identification code, not a promise that your curbside truck will take it — and mixing up the two is the single biggest reason recycling bins get contaminated and, in the worst cases, entire truckloads get sent to the landfill anyway.
This guide breaks down what curbside programs can actually process versus what only looks recyclable, so you can sort with confidence instead of guessing — or “wishcycling.”
Quick Answer
Curbside programs reliably recycle rigid containers: aluminum cans and foil, steel/tin cans, glass bottles and jars, paper, cardboard, and plastic bottles/jugs marked #1 (PET) or #2 (HDPE). They generally do NOT accept plastic bags, film, or wrap of any kind, most black plastic, Styrofoam, or anything with food residue — those need a different disposal path, usually a store drop-off bin or the trash.
What Reliably Gets Recycled Curbside
Metal is the easiest win: aluminum cans, aluminum foil (if reasonably clean and balled up), and steel or tin cans all have strong, established recycling markets and go straight in the bin.
Glass bottles and jars are widely accepted, and most municipal programs let you mix colors — the sorting happens later at the recovery facility. A few cities have moved glass to separate drop-off bins instead of curbside, so it’s worth a quick check of your local program’s list if you’re not sure.
Paper and cardboard — flattened boxes, paper bags, mailers, magazines, and most paperboard boxes (cereal, tissue) — are core curbside materials. Pizza boxes are a common source of confusion, but the old advice to tear off greasy sections is outdated: industry testing has found that grease and cheese at the levels typically found on a pizza box don’t meaningfully weaken the paper fiber during reprocessing, and the American Forest & Paper Association says whole pizza boxes can go straight in the bin. Just scrape off any leftover food, and if a box is fully soaked through with oil rather than just stained, trash it instead.
Rigid plastic containers stamped #1 (PET, like soda and water bottles) and #2 (HDPE, like milk jugs and detergent bottles) are the plastics with real, functioning recycling markets in most of the U.S. and Canada. Empty and rinse them — lids can typically stay on for #1 and #2 bottles in most programs, but check locally.
What Looks Recyclable but Usually Isn’t
Plastic bags, film, and wrap — grocery bags, bread bags, produce bags, bubble wrap, air pillows, shrink wrap, and plastic shipping envelopes — are the number one contaminant in curbside bins. They wrap around spinning equipment at the sorting facility and can shut the whole line down for cleaning. These need to go to a store drop-off bin (common at grocery store entrances) instead, not the curbside cart.
Black plastic is a problem because most sorting facilities use optical scanners that can’t detect black pigment, so it often gets misrouted to landfill even when the resin itself (like PET or HDPE) would otherwise be recyclable. Unless your local program explicitly says it accepts black plastic, treat it as trash.
Plastics numbered #3 through #7 (PVC, LDPE, polypropylene, polystyrene, and mixed/other plastics) are hit-or-miss. Many curbside programs accept #5 (PP) tubs and lids, but #3, #6, and #7 items frequently lack a real end market and get screened out during processing even if they’re tossed in the bin.
Styrofoam (expanded polystyrene) — foam cups, trays, and packing peanuts — is accepted by very few curbside programs because it’s lightweight, breaks apart easily, and isn’t economical to transport and process. Most cities direct it to the trash or a specialty drop-off location.
Containers still holding food or liquid — greasy takeout boxes with leftovers still in them, unrinsed jars, half-full bottles — can contaminate an entire batch of otherwise-recyclable material, so facilities often reject it outright. The fix is usually just emptying and rinsing, not throwing the whole container away.
Tips / Common Mistakes
Don’t bag your recyclables. Loose items in the cart get sorted correctly; a plastic garbage bag full of recyclables often gets tossed whole because sorting facilities can’t open every bag, and the bag itself is a film contaminant.
Empty containers and give them a quick rinse. You don’t need them spotless, but leftover food and liquid is one of the top reasons a whole batch of recycling gets rejected at the facility — though normal grease residue on cardboard, like on a pizza box, isn’t in this category.
When in doubt, check your specific city or hauler’s list rather than relying on the resin code. Acceptance varies a lot by region because it depends on which local sorting facility and end markets are available — a material accepted in one city may not be accepted a few miles away.
Keep small items out of the bin. Bottle caps, plastic utensils, and other small pieces fall through sorting screens and end up as machinery debris or landfill waste rather than getting properly sorted.
Skip “aspirational” recycling. Tossing something in the bin because it feels wasteful to throw away, even when you’re not sure it’s accepted, is called wishcycling — and it increases contamination, which can cause haulers to reject entire loads.
Explore more: Explore more packaging materials guides.
Curbside recyclable packaging materials FAQs
Does the chasing-arrows symbol mean a package is recyclable?
No. That symbol is a resin identification code showing what type of plastic the item is made from — it doesn’t guarantee any curbside program actually accepts or recycles it. Regulators including the EPA and states like California have pushed to limit this symbol on packaging that isn’t actually recyclable in most programs, since it misleads consumers.
Can I recycle a greasy pizza box?
Yes, in most programs. Industry testing has shown that typical amounts of grease and cheese don’t disrupt the paper-pulping process, and groups like the American Forest & Paper Association say you can recycle a pizza box as-is after removing leftover food. The only exception is a box so saturated with oil that it’s soggy — that one goes in the trash.
Can I recycle plastic bags and bubble wrap curbside?
Generally no. Plastic film and bags jam sorting equipment at recycling facilities. Instead, take them to a store drop-off bin, commonly found at grocery store entrances, which is specifically set up to handle flexible plastic film.
Why doesn’t my curbside program accept black plastic?
Most recycling facilities sort plastic using optical scanners, and black pigment absorbs the light those scanners use, so the material often can’t be identified and gets sent to landfill by default — even when the plastic itself would otherwise be recyclable.
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Photo by Julian Gojani on Unsplash.