KG's Heavy Duty Silicone Water & Stain Repellent 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
KG's Heavy Duty Silicone Water & Stain Repellent
PFAS grade
F 25/100
Overall grade
F 13/100
Verdict
Skip
Hazard flags
⚑ 3
Material
silicone-based water and stain repellent coating on textile
Confidence
45%
PossibleUndisclosed coating additives (catalysts, surfactants, crosslinkers)
PossibleFormaldehyde resins in textile base or finishing
PossibleCoating degradation and microparticle shedding over time
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