REI Co-op · Waterproof Sports Bags
REI Co-op Trailmade 10 Hydration Pack
Hydration pack with water-repellent coating; PFAS status unclear from brand.
REI Co-op does not publicly disclose PFAS treatment details for this pack. The water-repellent coating finish typical of hydration packs often uses PFAS, but without lab testing or brand confirmation, risk level remains uncertain.
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Material
nylon with water-repellent coating finish
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 Trailmade 10 uses nylon fabric with a water-repellent coating (water-repellent coating) finish. Nylon itself is chemically stable and does not leach known toxins under normal use. The water-repellent coating finish is the uncertainty: older water-repellent coating treatments relied on PFOA/PFOS, but modern formulations often use Teflon-type coating or fluorine-free alternatives. REI has not publicly disclosed which water-repellent coating chemistry is used in this model, so the specific fluorinated compound remains unidentified.
The brand's record and disclosure
REI Co-op has made general commitments to sustainable sourcing and chemical responsibility but has not published a detailed PFAS phase-out timeline or third-party certifications (such as Bluesign or OEKO-TEX) for its house-brand gear. The company's silence on this specific hydration pack's water-repellent coating formulation is notable, as transparency on PFAS in textiles has become a market expectation among outdoor retailers. No established recalls or contamination incidents are on record for this product line.
How it compares in its category
Hydration packs in this price and performance tier typically use nylon with water-repellent coating; the Trailmade 10 is standard for REI's entry-level offering. Competitors like Osprey and Deuter often supply technical data sheets or third-party certifications for their gear. REI's lack of public water-repellent coating transparency puts it in a middle position: not worse than unnamed brands, but behind competitors who actively disclose fluorine-free or certified low-PFAS treatments.
If you buy it
Wash infrequently and in cool water to minimize any potential leaching from the water-repellent coating finish; avoid hot water and dryers. Do not dry-clean, as solvents can degrade coatings unpredictably. Inspect seams and zippers annually for wear; once the fabric loses water beading noticeably (typically 2-5 years), the water-repellent coating is worn and replacement becomes reasonable. Store dry and out of direct sunlight to extend the coating lifespan.
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.”
water-repellent coating fluorine compounds (non-PFAS unknown)
REI has not disclosed whether this pack uses Teflon-type coating, fluorine-free, or legacy fluorinated water-repellent coating. Modern Teflon-type coating is considered safer than PFOA/PFOS but fluorine-free alternatives exist; actual composition is unconfirmed.
Azo dyes in nylon fabric
No specific azo dye concerns have been reported for REI Co-op nylon hydration packs. Nylon fibers are typically pre-dyed in controlled industrial settings with modern dye regulations in place.
Formaldehyde resins in finishes
While formaldehyde-based cross-linking resins are used in some textile treatments, no documented cases of off-gassing from REI Trailmade packs exist. Nylon does not require formaldehyde curing and most modern water-repellent coating finishes avoid it.
Microplastic shedding
Nylon hydration packs are not typically exposed to heat that would trigger microplastic release during normal outdoor use. Washing in cold water does not significantly increase fiber loss.
Coating degradation and leaching over time
water-repellent coating coatings naturally degrade with age and washing. As the finish wears, microscopic particles or residual treatment chemicals may shed into water or skin, though the quantity and toxicity depend on the fluorinated chemistry used, which is undisclosed.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% 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.