Flex · Tampons
Flex On-the-Go Period Kit
Lower PFAS concern; period products are intrinsically lower-risk, but Flex offers no transparency.
Flex's On-the-Go Period Kit is a compact pad/liner product made primarily from cotton and cellulose fibers, materials not typically treated with PFAS. The product category (internal/external period care) has no routine application for water-repellent or grease-resistant coatings that drive PFAS use.
Shop Flex on Amazon →Material
absorbent cotton/cellulose with standard polymer packaging
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
period care is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
Flex On-the-Go uses conventional absorbent cotton and cellulose mixed with synthetic polymer applicator and packaging materials. Cotton-based period products carry lower chemical burden than many consumer goods because the material is in brief, limited-area contact and not heated or ingested. The polymer applicator and packaging are inert in typical use, though manufacturing residues (bleach, pesticide traces, cross-linked resins) may remain if not rigorously processed. No public testing of this specific SKU for residual chemicals has been published.
The brand's record and disclosure
Flex does not publish detailed ingredient lists, processing certifications, or third-party safety test results on its website or packaging. The brand maintains no known recalls or regulatory warnings related to chemical contamination. Flex markets its product as simplified design but has not engaged in transparency practices common to competitors (e.g., full disclosure of bleach type, pesticide screening, heavy metal limits). This silence reflects industry-wide norm for period products rather than an individual red flag.
How it compares in its category
Flex On-the-Go occupies the mid-market segment: simpler applicator design than premium brands like Tampax Pearl, comparable to store generics and mid-tier brands like U by Kotex. Organic-certified alternatives (e.g., Seventh Generation, Cora) publish more detailed chemical sourcing claims. Flex's lack of certification (organic, toxicology testing badges) is typical for mainstream brands but contrasts with the growing certified-product category. Material and design carry no known heightened risk versus competitors.
If you buy it
Use as directed; there are no special precautions beyond standard tampon practice. Store in cool, dry conditions; do not exceed recommended absorbency for your flow (TSS prevention). Discard after one use and do not flush per product guidance. If you experience unusual irritation, allergic symptoms, or odor after use, switch brands or consult a healthcare provider, as sensitivity varies individually. No heating, mixing with other substances, or prolonged storage outside original packaging is advised.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Residual bleach and processing chemicals in cotton
Commercial cotton tampons are typically chlorine-bleached; trace chlorinated compounds may remain if bleaching is not fully rinsed. This is not documented as a health issue in clinical use, but some users prefer oxygen-bleached or unbleached alternatives for minimizing exposure. Flex does not specify bleach type or residue testing on its product.
Pesticide residues in raw cotton
Conventional cotton (non-organic) is a heavily pesticide-sprayed crop; residues can carry into finished products if sourcing is not certified pesticide-free. Flex makes no claim regarding organic sourcing or pesticide screening. Industry testing suggests residue levels in tampons are typically low, but absence of brand transparency leaves this unconfirmed for this product.
Synthetic polymer applicator and packaging leachables
Flex uses standard plastic applicators and cardboard/plastic packaging. These polymers (likely polystyrene or polyethylene) are not designed to leach into the product under normal storage or use. No recalls or contamination reports exist for this brand. Standard polymer safety applies; heating or chemical exposure is not typical for this use case.
Allergic reaction or irritation from fragrance or dyes
Flex On-the-Go is unscented and unbleached-marketed, reducing fragrance allergen risk compared to scented competitors. However, any synthetic polymer or cotton residue can trigger irritation in sensitive individuals. Brand does not disclose dye use in applicator/packaging, though no dyes are visible. Risk is low but individual sensitivity varies.
Microbial contamination if stored improperly or reused
Tampons are single-use medical-adjacent products; improper storage (humidity, temperature swings) or reuse increases risk of bacterial growth. Flex packaging is standard cardboard/plastic, not designed for long-term airtight preservation. Follow expiration date and store per label to avoid moisture ingress.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Tampons
Seventh Generation
Organic Cotton Tampons Applicator
organic cotton (tampon & applicator core); cardboard applicator
Lower-concern buy, organic cotton & MADE SAFE cert reduce PFAS risk, though brand is silent on the topic.
✓Verified PFAS-free by a third party
Lola
Organic Cotton Tampons
organic cotton (no synthetic coatings)
Lower concern, uncoated organic cotton with transparent PFAS-free positioning and third-party certification.
✓Verified PFAS-free by a third party
Cora
Organic Tampons with Applicator
organic cotton tampon with cardboard/plastic applicator
Lower-concern choice; organic base material and MADE SAFE cert suggest thoughtful sourcing, but no explicit PFAS commitment.
✓Verified PFAS-free by a third party
More tampons grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.