Wren Waterproof Storage Case
Skip until brand discloses waterproof coating chemistry.
This rigid case uses waterproof coating of unknown makeup. The brand discloses nothing about coating chemistry, and waterproof finishes often contain PFAS.
The better-graded swap
Zarges
zarges K470 Aluminum Shipping And Storage
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
rigid plastic case with waterproof coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
You may also be interested in
Top-graded picks in the categories readers replace first, every one scored on the same rubric.
- polypropylene filter housing, carbon/sediment cartridge
- We found no PFAS statement from the brand
- Bacterial growth in spent cartridges
3 hazards checked on this product, all on its full breakdown.
Aquasure
Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
- RO membrane, carbon filters, stainless steel housing
- We found no PFAS statement from the brand
- Bacterial and microbial growth in housing and filters
4 hazards checked on this product, all on its full breakdown.
Avocado
Vegan Mattress
- organic cotton, natural latex, coconut coir, recycled steel coils
- The brand calls it PFAS-free, which we have not verified
- Heavy metals
2 hazards checked on this product, all on its full breakdown.
What Wren Waterproof Storage Case is made of, ingredients and materials
Wren is a rigid plastic storage case with an applied waterproof coating. The base plastic is likely polypropylene (PP) or acrylonitrile butadiene styrene (ABS), both common in hard protective cases. The waterproof coating is the critical unknown, it may contain Teflon-type coating, polyurethane, silicone, or fluorinated compounds (PFAS). Without brand disclosure, you cannot confirm what chemical barriers are protecting against water ingress.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
PFAS
If the coating contains polyurethane or silicone, prolonged contact with water or humid storage may cause minor leaching of oligomers into stored items. Risk is low for dry goods but unknown for liquids stored longer than weeks.
Source, ATSDR ↗Coating degradation and particle release
Over time or with UV exposure, waterproof coatings can crack, peel, or flake. Inhalation of small particles is unlikely in normal use, but microparticles may contaminate stored contents if the case is used for food or water.
Off-gassing from plastic or adhesives
Newly manufactured hard cases may emit low levels of volatile organic compounds (VOCs) from the plastic resin or glues bonding the waterproof layer. This odor typically dissipates within days to weeks. Ventilate the case before sealing sensitive items.
What’s reassuring
BPA & bisphenols
Rigid polypropylene and ABS do not inherently contain BPA or BPS. However, if the case was manufactured before 2010 or uses recycled plastic, trace contaminants are theoretically possible. No specific recalls or testing results are available for the Wren model.
Source, FDA ↗Heavy metals
Modern polypropylene cases rarely use lead or cadmium pigments, but third-party lab testing for the Wren is not publicly available. If the case is brightly colored, pigment sources are unverified.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
The brand has not publicly disclosed the chemistry of the waterproof coating on the Wren or other product lines. No major safety recalls or certifications (e.g., FDA, NSF) are on record for this specific model. The brand's silence on PFAS and coating materials is a red flag for transparency-conscious buyers, though this does not prove presence of hazardous chemicals.
How it compares in its category
Hard plastic storage cases like the Wren have lower concern than soft fabric alternatives for non-food storage because rigid plastics off-gas less. However, competitors such as Pelican and OtterBox have published material specifications; The brand does not. Many waterproof cases now use coatings with lower PFAS concern, making the Wren's opacity a competitive disadvantage.
If you buy it
Keep the case away from heat sources (sun, vehicles, ovens) to prevent coating degradation and potential vapor release. Do not store food, water bottles, or anything for prolonged mouth contact without a sealed inner barrier. Inspect the seams and coating annually for cracks or flaking; if found, discontinue use or wrap contents in a protective layer. Clean with plain water and mild soap; avoid solvents that might degrade the waterproof layer.
What is not known about PFAS in this product?
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Wren Waterproof Storage Case?
- Aluminium alloy, bare unpainted surface
- We found no PFAS statement from the brand
- Aluminium leaching (acidic food contact)
3 hazards checked on this product, all on its full breakdown.
- Aluminum with optional plastic lids
- We found no PFAS statement from the brand
- Aluminum leaching
2 hazards checked on this product, all on its full breakdown.
- Aluminum with stainless steel hardware and latch mechanisms
- We found no PFAS statement from the brand
- Aluminum leaching (minimal)
3 hazards checked on this product, all on its full breakdown.
More jewelry cases & organizers grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.