Watershed · Waterproof Sports Bags
Watershed Westwater Backpack
Waterproof backpack; coating type not disclosed, raises concern.
Watershed Westwater is a durable waterproof pack, but the brand does not disclose whether water-repellent coating uses PFAS or PFAS-free alternatives. Contact them directly for treatment specifics.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Coated nylon/TPE, waterproof treatment unspecified
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
clothing is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Westwater uses nylon fabric with a TPE (thermoplastic elastomer) or similar polymer coating for water resistance. The waterproofing agent itself is not disclosed by Watershed, which is the core concern: modern waterproof coatings are frequently Teflon-type coating-based (Teflon-class) or Teflon-family coating-heavy, and without transparency you cannot rule out PFAS. TPE coatings themselves are generally considered lower-toxicity polymers compared to PVC, but their durability and leaching profile depend heavily on additives not specified here.
The brand's record and disclosure
Watershed manufactures dry bags and waterproof gear primarily for outdoor sports. The brand has not published a clear PFAS policy or materials transparency statement as of available records, which is a significant gap given the water-sports market's environmental and health scrutiny. No major product recalls or contamination incidents are on record for this model. The silence on coating chemistry is a red flag in an industry where competitors (notably some European and Japanese brands) have begun disclosing Teflon-family coating use.
How it compares in its category
Waterproof backpacks typically fall into two camps: Teflon-type coating/Teflon-family coating-coated (faster water shedding, higher PFAS risk) and wax-treated, polyurethane, or silicone-sealed alternatives (lower PFAS certainty but often heavier or less durable). The Westwater's TPE coating sits in a middle ground, but without disclosure it is harder to benchmark. Brands like Patagonia and some REI Co-op packs now specify non-fluorinated coatings; Watershed has not matched this transparency.
If you buy it
Avoid machine washing or high heat (which can accelerate coating breakdown and potential leachate release); hand wash with cool water and mild soap, then air-dry completely. Inspect seams and coating for cracks or peeling annually; a compromised coating increases microplastic and additive shedding risk. Store in a cool, dry space away from direct sunlight to slow polymer degradation. Consider retiring it after 5-7 years of heavy use, as TPE coatings degrade and their breakdown products are poorly characterized.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Waterproofing coating degradation and leachate
TPE and similar polymer coatings degrade with UV exposure, mechanical stress, and age. As they break down, additives (plasticizers, flame retardants, or undisclosed chemicals) may leach into skin contact zones or the environment. Without coating-type disclosure, the specific hazard profile is opaque.
Formaldehyde in nylon dyes or finishes
Nylon fabric production often involves formaldehyde-based resins for dye fixation or wrinkle resistance. The Westwater's nylon base may contain residual formaldehyde, particularly if dyes are not thoroughly cured. This is a standard concern in technical textiles and is difficult to verify without mill certification.
Azo dyes in coloring
Watershed does not publish dye standards. If the pack uses conventional acid or direct azo dyes on nylon, these can include azo compounds that degrade to carcinogenic amines under stress (sweat, heat, friction). European regulations restrict some azo dyes but are not universally enforced in imported gear.
Microplastics from coating or fabric shedding
TPE-coated fabrics shed microplastics when abraded or aged, particularly at seams and high-stress zones. Nylon itself also sheds microfibers during use. No brand-specific data exists, but this is a general hazard for all synthetic waterproof textiles; frequency depends on coating integrity.
Undisclosed additives in TPE or adhesives
TPE formulations commonly include plasticizers, stabilizers, and flame retardants to meet performance specs. Watershed's silence on these means you cannot assess for phthalates, antimony compounds, or brominated retardants that may be present in the adhesive bonding the coating to nylon.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Waterproof Sports Bags
Garmin
Carrying Case
Neoprene or polyester case, material unspecified
Unknown material raises concern; no PFAS disclosure from Garmin.
⚠Risky category by default
Patagonia
Guidewater Sling
recycled polyester with water-repellent coating finish
Lower concern; brand committed to PFAS-free water-repellent coating, but verify current batch
⚠Waterproof or stain-proof treatment
More waterproof sports bags 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.