Grease-Proof 4 lb. HDPE Graphic Bakery Bag - 5"L x 3"D x 11"H
Exercise caution as grease-proof food bags commonly use PFAS coatings; Westrock provides no transparency.
This HDPE bakery bag carries a grease-proof treatment, a known vector for PFAS use in food packaging. Westrock does not publicly disclose the coating chemistry or PFAS status.
The safe swap
Duro Bag Manufacturing
Duro Bag 25 lb Short Heavy Duty Kraft Grocery Bag
70/100 safety
Same rubric that flunked this product. The swap earned Good.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
HDPE plastic with grease-proof coating (composition unspecified)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Waterproof / stain-resistant treatment
Water-repellent treatments have historically contained PFAS chemicals.
Category baseline
PFAS exposure happens more often with clothing products.
No PFAS disclosure
The company has not publicly discussed PFAS in this product.
PFAS
Grease-proof food bags commonly use PFAS-based compounds; Westrock has disclosed no alternative. This is not established for this specific bag, but the product category and brand silence suggest PFAS exposure is probable with regular use.
Source: ATSDR ↗Coating degradation and microplastic migration
Polymer coatings degrade with age, moisture, and temperature cycling. Use-wear in bakery settings (stacking, handling, humidity) may release microplastics or coating fragments into food over months of storage.
Thermal instability of coating under heating
Placing warm baked goods into the bag may soften or partially dissolve the grease-proof layer, promoting migration of coating compounds into food. The specific thermal threshold of Westrock's coating is not public.
Allergen or food-residue contamination from recycling stream
If this bag uses recycled HDPE, prior food contact history is unknown. Bakery bags touching multiple foods pose cross-contamination risk in commercial kitchens, though this is a use-hygiene rather than material hazard.
What’s reassuring
BPA & bisphenols
HDPE itself does not contain BPA or phthalates in manufacture; however, recycled HDPE can occasionally harbor trace contaminants. Westrock does not specify resin sourcing for this bag.
Source: FDA ↗The full breakdown
What it's made of and why it matters
This bag is HDPE (high-density polyethylene), a relatively stable plastic that does not leach BPA or phthalates under normal use. However, the "grease-proof" coating is the critical unknown: manufacturers typically use fluorinated compounds (PFAS-based) or wax to repel oils and moisture. Westrock does not publicly disclose the coating chemistry, which is standard industry silence on PFAS in food packaging. HDPE itself is food-safe under cold to warm conditions, but the coating's thermal stability and migration profile are unverified here.
The brand's record and disclosure
Westrock is a major packaging conglomerate with no public PFAS reduction commitments or transparency statements on their food-contact coatings as of available records. The company has not published third-party testing or safer-alternative timelines for grease-proof bags. This silence is consistent with industry practice but leaves consumers without reassurance. No recalls or regulatory actions specific to this product line are on record, but absence of disclosure does not indicate absence of PFAS.
How it compares in its category
Grease-proof bakery bags are almost universally coated with either PFAS or plant-based waxes; Westrock does not advertise a wax-only option, making this a mainstream mid-tier choice. Many smaller or specialty brands now offer certified PFAS-free or compostable alternatives, though at higher cost. Standard uncoated kraft or paper bags have no coating risk but lose grease resistance. This product occupies the convenience-over-transparency position common in foodservice supply.
If you buy it
Use these bags for dry baked goods (bread, pastries, cookies) where the coating does not contact wet or hot foods directly. Do not microwave or place warm foods into the bag while still hot; let baked items cool first. Avoid using them for foods with high oil content or prolonged storage in contact with the coating. Replace bags every 6-12 months if used regularly, as plastic can degrade and shed particles over time. If you are pregnant, nursing, or concerned about PFAS exposure, switching to uncoated kraft or certified PFAS-free bags is prudent.
What we don’t know
- Basis
- Model estimate, 42% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Westrock has made none
Formulations change between production runs, so check the current label. How we grade.
Safer alternatives in Bakery Bags
Duro Bag Manufacturing
Duro Bag 25 lb Short Heavy Duty Kraft Grocery Bag
Unbleached kraft paper
Mold or microbial growth on stored paper
Limited concern
Lower concern as uncoated kraft is unlikely to contain PFAS, though Duro offers no transparency.
⚠Risky category by default
Duro Bag Manufacturing
Duro Bag 71010 Heavy-Duty Kraft Grocery Bag
kraft paper, uncoated or minimal treatment
Mold and microbial contamination
Limited concern
Lower PFAS concern; uncoated kraft bags rarely need fluorinated water or grease barriers.
⚠Risky category by default
If You Care
5 1/4" x 7 1/2" Kraft Bakery Bag w/ Clear Front
Kraft paper with unbleached cellulose; clear window (likely cellulose film or polyester); no added fluorinated treatment
Ink and dyes on printed surfaces
Limited concern
Cellulose film window degradation and microparticles
Limited concern
Adhesive or glue residues (window seal)
Limited concern
Mold and bacterial growth if moisture intrusion occurs
Limited concern
Lower concern as kraft plus clear window design avoids typical PFAS treatment.
⚠Waterproof or stain-proof treatment
More bakery bags 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.