Sea to Summit TPU Guide Waterproof Case vs M40 Micro Case: which is safer?

Pelican M40 Micro Case is the clear pick. Sea to Summit TPU Guide Waterproof Case carries a failing PFAS grade, and we never recommend buying a failing product.

Sea to Summit TPU Guide Waterproof Case

Dexcraft

Sea to Summit TPU Guide Waterproof Case

PFAS grade

F 40/100

Overall grade

F 28/100

Verdict

Skip

Hazard flags

⚑ 3

Material

TPU (thermoplastic polyurethane) with waterproof coating

Confidence

35%

PossibleWaterproof coating composition (likely fluorochemicals)

PossibleTPU thermal degradation and volatile release

PossibleCoating adhesion loss and microparticle shedding

Why this grade

Our pick

Pelican M40 Micro Case

Pelican

M40 Micro Case

PFAS grade

A 100/100

Overall grade

B 88/100

Verdict

Buy

Hazard flags

⚑ 3

Material

Polypropylene copolymer plastic case with solid construction, no Teflon-family coating

Confidence

78%

PossiblePolypropylene degradation and microplastic shedding

PossibleGasket and latch material safety

PossibleMold and bacterial growth in sealed environment

Why this gradeBuy

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 personal electronics: see the full ranking