Mountainsmith Review, Is Mountainsmith Non-Toxic?
Mountainsmith averages 20 out of 100 on PFAS Authority's PFAS and toxin screen across the 8 Mountainsmith products graded as of October 2026, and none of them reach its 70 point pass mark.
Mountainsmith grades Bad on our four-band scale. On disclosure, the brand says nothing publicly about PFAS. See what every brand has published about PFAS for how that compares.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
Does Mountainsmith have PFAS, by category
Graded and flagged Poor and Bad, we’d swap these
Mountainsmith
Apex 80 Backpack
- Nylon fabric with water-repellent coating
- We found no PFAS statement from the brand
- PFAS, Mountainsmith does not disclose water-repellent coating chemistry. Nylon water-repellent coating…
2 hazards checked on this product. See all of them.
Mountainsmith
Backpack Raincover
- Polyester with water-repellent coating water-repellent coating, unspecified
- We found no PFAS statement from the brand
- Formaldehyde / VOCs, Polyester textiles often use formaldehyde-based resins for wrinkle resistance and shape…
4 hazards checked on this product. See all of them.
Mountainsmith
Divide EVO Daypack
- nylon ripstop with water-repellent coating treatment, specific chemistry unspecified
- We found no PFAS statement from the brand
- PFAS, Mountainsmith does not disclose water-repellent coating chemistry. Nylon ripstop water repellents…
2 hazards checked on this product. See all of them.
Mountainsmith
Dry Kick Waterproof Fanny Pack
- Ripstop nylon with unspecified waterproof coating
- We found no PFAS statement from the brand
- Volatile organic compounds (VOCs) from waterproof coating, Unspecified water-repellent coating may release…
2 hazards checked on this product. See all of them.
Mountainsmith
Epic Lumbar Pack
- Nylon with water-repellent coating water-repellent coating
- We found no PFAS statement from the brand
- water-repellent coating degradation and microparticle shedding, As the water-repellent finish wears over…
Mountainsmith
Mayhem EVO 30 Backpack
- nylon with water-repellent coating (water-repellent coating) finish
- We found no PFAS statement from the brand
- PFAS, The water-repellent coating finish on this pack is undisclosed; if fluorinated (Teflon-type coating or…
Mountainsmith
Zerk 40 Backpack
- Nylon pack fabric with water-repellent coating
- We found no PFAS statement from the brand
- water-repellent coating (water-repellent coating) coating composition, water-repellent coating finish is…
Mountainsmith
Backpack Rain Cover
- synthetic fabric with water-repellent coating water-repellent coating, composition unspecified
- We found no PFAS statement from the brand
- water-repellent coating degradation and particle shedding, Rain covers experience mechanical wear and UV…
2 hazards checked on this product. See all of them.
Mountainsmith and PFAS, common questions
- Does Mountainsmith have PFAS?
- Mountainsmith averages 20 out of 100 on PFAS Authority's PFAS and toxin screen across the 8 Mountainsmith products graded as of October 2026, and none of them reach its 70 point pass mark. Grades are model-based estimates built from published materials, ingredients and disclosures, not lab tests.
- Is Mountainsmith non-toxic?
- No Mountainsmith product we graded reaches Good. The best of them is Mountainsmith Apex 80 Backpack at 20/100.
- Which Mountainsmith products should I avoid?
- The lowest-graded Mountainsmith products we have scored are Mountainsmith Backpack Rain Cover, Mountainsmith Zerk 40 Backpack, Mountainsmith Mayhem EVO 30 Backpack. Each one links to the evidence behind its grade.
Every grade uses the same public rubric. How grades work →