Humangear Stax vs Co-op Trailgate Gear Cube Green 15 L: which is safer?

Humangear Stax is the clear pick. REI Co-op Trailgate Gear Cube Green 15 L carries a failing PFAS grade, and we never recommend buying a failing product.

Our pick

REI

Humangear Stax

PFAS grade

A 100/100

Overall grade

B 84/100

Verdict

Buy

Hazard flags

⚑ 4

Material

polypropylene plastic

Confidence

72%

PossibleMicroplastic release from mechanical wear

PossibleThermal degradation and chemical leaching at elevated temperatures

PossibleMold and bacterial growth in crevices

Why this gradeBuy

REI

Co-op Trailgate Gear Cube Green 15 L

PFAS grade

F 40/100

Overall grade

F 14/100

Verdict

Skip

Hazard flags

⚑ 3

Material

Nylon fabric with water-repellent coating water-repellent treatment

Confidence

45%

LikelyPFAS in water-repellent coating treatment

PossibleNylon microfiber shedding

PossibleDegradation and off-gassing under heat or UV

Why this grade

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 gear storage: see the full ranking