z 7S Series All-Weather Cover vs Ultra- Sil Stuff Sack Set: which is safer?
Sea To Summit Ultra- Sil Stuff Sack Set is our pick: better on PFAS and on the overall hazard picture.
Keen
z 7S Series All-Weather Cover
PFAS grade
F 20/100
Overall grade
F 0/100
Verdict
Skip
Hazard flags
⚑ 4
Material
polyester/nylon with water-repellent coating
Confidence
45%
LikelyPFAS in water-repellent coating (reported in category; status unclear for this product)
PossibleAntimony in polyester (catalyst residue)
PossibleVolatile organic compounds (VOCs) from finish application
Our pick
Sea to Summit
Ultra- Sil Stuff Sack Set
PFAS grade
D 65/100
Overall grade
analysis pending
Verdict
pending
Hazard flags
none flagged
Material
Ultra-Sil nylon fabric, no water treatment applied
Confidence
78%
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More waterproof outdoor accessories: see the full ranking