Can you recycle berry clamshells?
Usually yes
Usually yes, if it carries the #1 code. A berry clamshell is the same plastic as a water bottle, formed a different way. Take out the absorbent pad at the bottom first, and check the code, because the near-identical #6 clamshell is landfill.
Follow it down the line
Three different questions hide inside "is this recyclable?", and the answer can change at each step.
The material · Yes
Is the material recyclable?
A clamshell is a thermoform, made by heating a sheet of polyethylene terephthalate until it is pliable and then shaping and trimming it, which is a different process from blowing a bottle but the same polymer at the end of it. The industry definition is unusually concrete, and it is worth quoting the list because it tells you how broad this family is: egg cartons, baskets, clamshell containers, cups, lids, cake domes, covers, blister packs without paperboard backing, tubs, deli containers and trays all count as PET thermoforms when they carry the #1 code. The recovery numbers are moving in the right direction and quickly. The US and Canada collected 264 million pounds of PET thermoform packaging in 2024, a 52% increase on the year before. The one warning at this layer is that the family is defined by the code and not by appearance: most thermoforms are PET, but not all of them are, and the ones that are not look exactly the same.
Source: NAPCOR: PET thermoform recycling
The facility · Sometimes
Will a sorting facility recover it?
Thermoforms are handled as a near relative of bottles rather than as bottles, and the trading rules show exactly how near. APR's model bale specification for PET bottles allows thermoforms to be included at more than two percent but not more than ten percent of the bale by weight, and requires that every thermoform piece be optically sorted as PET. Read that as a description of the practical constraint. The equipment can identify these containers, the mills can use them, and the tolerance is a limit on how much of a bottle bale can be something that behaves slightly differently in the wash and the melt. It also explains why the thing that hurts most here is the look-alike. A polystyrene clamshell that reaches the optical sorter looking like PET is precisely the contamination the specification is drawn to keep out, and no amount of care at the facility fixes a mis-identification made in your kitchen.
Source: APR: model bale specification, PET bottles with PET thermoforms
Your curbside program · Varies
Will your curbside program take it?
Where thermoforms are collected, berry containers are squarely in scope. Napa takes plastic fruit baskets in the recycling cart, both the vented green kind and the clear clamshell, and adds the instruction most people miss: if there is a moisture pad in the bottom, take it out and put it in the landfill cart. That pad is an absorbent laminate, not part of the container, and leaving it in puts a wet composite through the wash with the PET. The same program draws the line that matters on clamshell packaging generally, and it is a code check rather than a look: clear clamshell packaging is typically #1 PET or #6 PS, the #1 goes in the recycling cart and the #6 goes in the landfill cart. One more branch worth knowing, because it sends the container somewhere else entirely: fruit baskets made of pulped paper, the egg-carton-like material, go in the compost.
Sources: Napa Recycling: fruit or berry baskets, plastic, Napa Recycling: packaging, hard plastic clamshell
What you need to do
- Check the code. #1 goes in the cart, #6 looks identical and does not
- Take out the absorbent moisture pad and bin it separately
- Empty and rinse. Berry juice is sugar, and sugar is contamination
- Leave the lid attached to the base rather than snapping off a separate small piece
Where else it can go
Give it back to the farm stand
Vented berry baskets are reusable by anyone selling berries by volume, and small growers often take them back.
Ask first, and only offer clean dry ones. A market stall does not want your compost.
Reuse it at home
A clamshell is a free vented storage box, and the vents are the useful part: seed starting, small parts, anything that should not sweat.
Compost the pulp ones
The molded fiber baskets are the same material as a pulp egg carton and go to compost rather than to recycling.
Only the plain molded fiber. Anything with a plastic film or window is not that.
Common mistakes
- Sorting by appearance rather than by the resin code, when the #6 look-alike is the exact contaminant the bale spec exists to exclude
- Leaving the moisture pad in the bottom, which sends an absorbent laminate through the wash with the PET
- Assuming a clamshell is not recyclable because it is not a bottle. It is the same polymer, formed from sheet
- Putting a molded pulp berry basket in the recycling when it belongs in the compost
- Recycling it with fruit still inside, which is the ordinary food-residue problem in a container that hides it well