ToughSack Assorted Colors vs Discovery Dry Bag: which is safer?
Granite Gear ToughSack Assorted Colors is the clear pick. SealLine Discovery Dry Bag carries a failing PFAS grade, and we never recommend buying a failing product.
Our pick
Granite Gear
ToughSack Assorted Colors
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleHeavy metals in zippers or hardware
SealLine
Discovery Dry Bag
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleCoating leaching and chemical migration
LikelyDegradation of waterproof integrity over time
PossibleMicroplastic generation from fabric abrasion
Where these two actually differ
- We flag Heavy metals in zippers or hardware on the Granite Gear and not on the SealLine.
- We flag Coating leaching and chemical migration, Degradation of waterproof integrity over time, Microplastic generation from fabric abrasion and Undisclosed waterproofing chemistry (possible PFAS or alternatives) on the SealLine and not on the Granite Gear.
- The Granite Gear is Cordura nylon fabric where the SealLine is Urethane-coated nylon fabric with waterproof treatment, which is most of the difference in these two grades.
- The gap is 45 points, wide enough that this is not a close call, and the Granite Gear is the one to buy.
- We are less certain about the SealLine grade, at 45% confidence against 72%, because it discloses less.
Both products run through the same public rubric, which covers 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 bags & luggage, see the full ranking