Mountainsmith · Portable Outdoor Gear Bags
Mountainsmith Epic Lumbar Pack
Typical outdoor pack; water-repellent coating likely contains PFAS, brand silent on specifics.
Mountainsmith does not disclose PFAS content or water-repellent coating treatment details. Most outdoor lumbar packs use fluorinated water-repellent coating coatings, though this brand has not confirmed or denied PFAS use.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Nylon with water-repellent coating water-repellent coating
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 Epic Lumbar Pack is constructed primarily from nylon fabric with a water-repellent coating (water-repellent coating) coating applied to the exterior. water-repellent coating coatings on outdoor gear historically use fluorochemical compounds to achieve water-shedding properties; the specific chemistry of Mountainsmith's coating is not publicly disclosed. Nylon itself is stable and low-toxicity in normal use, but the performance finish is the material of concern for this product class.
The brand's record and disclosure
Mountainsmith has not issued public statements regarding PFAS use, fluorochemical alternatives, or third-party testing of their packs. The brand does not advertise PFOA-free or PFAS-free manufacturing, nor do they appear on lists of outdoor gear makers committed to fluorochemical phase-out. This silence is typical of mid-tier outdoor brands but limits consumer ability to verify coating safety.
How it compares in its category
Lumbar packs in this price and feature range almost universally use fluorochemical water-repellent coating coatings; PFAS-free alternatives are rare and typically more expensive or less water-resistant. Mountainsmith's opacity matches industry norms rather than distinguishing them as worse, but it also means no competitive advantage in transparency. Consumers prioritizing PFAS avoidance will find few mainstream outdoor pack options without switching to niche brands.
If you buy it
Wash the pack in cool water with mild detergent; avoid machine washing or heat drying, which can degrade the water-repellent coating and potentially release coating particles. Reapply commercial water-repellent coating sprays if water repellency fades after 1-2 seasons of heavy use. Store in a cool, dry place away from direct sunlight to prevent nylon oxidation. Do not expose to high heat, open flame, or prolonged chlorine exposure.
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 degradation and microparticle shedding
As the water-repellent finish wears over time, microscopic coating fragments may shed into the environment or contact skin. No specific data exists for Mountainsmith packs, but this is a documented concern for all fluorochemical-coated outdoor textiles with heavy use.
Formaldehyde resins in textile finishing
Nylon packs sometimes receive formaldehyde-based resin treatments for wrinkle resistance or mildew prevention; Mountainsmith does not publish finishing chemistry, so presence cannot be ruled out but is not established for this model.
Azo dyes in colored nylon
The Epic pack is available in multiple colors; azo dyes (which can release carcinogenic amines under certain conditions) are used in some nylon dyeing. No recalls or warnings exist for Mountainsmith packs, and modern textile suppliers typically avoid restricted azo dyes in developed markets.
Antimony in polyester thread or trim
If the pack uses polyester thread, webbing, or trim (common for durability), antimony trioxide catalyst residue is theoretically possible but not documented for this brand or product line.
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 Portable Outdoor Gear Bags
REI Co-op
Trailgate Gear Bin Green 140 L
Polypropylene storage bin, no water-resistant coating mentioned
Lower PFAS concern for bare plastic storage container.
⚠Risky category by default
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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.