Compare Food Storage Containers
Weck 743 Mold Jar Transparent Glass Food Storage Containers with Airtight Lids (3/4 Liter Tall Jars, Set of 4) scores higher on safety - here's why.
R3 scored the Weck 743 Mold Jar Transparent Glass Food Storage Containers with Airtight Lids (3/4 Liter Tall Jars, Set of 4) 9.7/10 and the Ziploc Food Storage Meal Prep Containers with SmartSnap Technology (Deep Square, 3-Pack) 6.6/10 on the same food storage containers scoring system, weighing safety, efficacy, and usability. The Weck 743 Mold Jar Transparent Glass Food Storage Containers with Airtight Lids (3/4 Liter Tall Jars, Set of 4) comes out ahead, led by its safety score (9.7/10 vs 6.7/10).
The most important dimensions, side by side.
Unlock the full Weck 743 Mold Jar Transparent Glass Food Storage Containers with Airtight Lids (3/4 Liter Tall Jars, Set of 4) vs Ziploc Food Storage Meal Prep Containers with SmartSnap Technology (Deep Square, 3-Pack) breakdown
Free account unlocks all safety scores, complete spec comparison, scoring rationale, and the R3 verdict on which one to buy.
See which one actually scores higher — and why
Free account unlocks full safety scores, spec-by-spec breakdown, and the R3 verdict on Weck 743 Mold Jar Transparent Glass Food Storage Containers with Airtight Lids (3/4 Liter Tall Jars, Set of 4) vs Ziploc Food Storage Meal Prep Containers with SmartSnap Technology (Deep Square, 3-Pack).
Safety Context
Here's what our analysis flagged on the safety front - not to alarm you, but because this is exactly the kind of detail that's hard to find in a spec sheet.
Weck
Active Prop 65 warning
California requires this disclosure when a product contains substances on its list - it doesn't mean it's unsafe, but it's worth factoring in for families with young children.
Ziploc
No active safety flags in our analysis.
Safety flags affect scores - safety is the highest-weighted pillar in our scoring system. If a product has an active Prop 65 warning, that's reflected in its safety pillar rating above. The comparison above shows exactly where the gap lives.
Everything you need to make the call - who each one is for, and who should skip it.
Go for it if you...
Safety is your top priority - this product scores highest on material safety.
You want the best value for money in this category.
Performance is what matters most to you.
You want the most convenient daily-use container with one-handed snap-close lids
You need the most affordable option — under $6 per container is hard to beat
You pack lunches for kids and need lightweight, shatter-proof containers
Convenience and cost matter more to you than eliminating plastic from food storage
The main thing to know
Independent testing found lead in the exterior glass glaze (142-159 ppm) — this is on the outside of the jar, not on food-contact surfaces, but it triggers a California Prop 65 warning that families with young children should be aware of.
Every surface that contacts your food is polypropylene plastic — the container, the lid, and the seal mechanism. While PP is FDA-approved and BPA-free, families seeking to reduce plastic food contact should look at glass alternatives.
Skip this if you...
You need quick one-handed access for busy meal prep — the two-clamp lid system requires both hands and more steps than snap-on alternatives.
You want fully dishwasher-safe containers — the glass jars go in, but the rubber gaskets and stainless steel clamps must be hand-washed.
You have very young children who handle food containers independently — the exterior glaze contains lead at levels that trigger a Prop 65 warning.
You want to reduce plastic contact with your food — glass options exist at similar per-piece prices
You need oven-safe containers for fridge-to-oven cooking
You want PFAS-free verification or detailed material disclosure beyond "BPA-free"
Neither of these quite what you're looking for?
I've reviewed all Food Storage Containers options at every price pointEvery Food Storage Containers in our database is scored using R3's deterministic scoring system - the same inputs always produce the same score. For this comparison, we evaluated Weck and Ziploc across 3 independent criteria: Safety (94%), Efficacy (6%), Usability (1%). No sponsored rankings. No paid placements.
Straight answers - no sponsored content, no filler.
I'd start with Weck Weck 743 Mold Jar Transparent Glass Food Storage Containers with Airtight Lids (3/4 Liter Tall Jars, Set of 4) - it scored 9.7/10 overall in our scoring system. Safety is our top-weighted scoring pillar, followed by efficacy, and usability. Check which pillar matters most to your family and compare those specific scores.
R3 uses a deterministic scoring system - the same inputs always produce the same score. We evaluate each Food Storage Containers across Safety, Efficacy, Usability using independently verified data. No sponsored rankings. No paid placements. Every score is fully reproducible.
Not necessarily. The overall score reflects how we weight those three pillars, but your priorities may differ. If you care most about safety, compare the safety scores directly. If budget drives your decision, the prices tell a clearer story. The "right" pick is the one that matches what matters most to your family.
Not the right match? Explore these alternatives in the same category.
Caraway
Caraway 14-Piece Glass Food Storage Container Set
9.7
Snapware
Snapware Total Solution 6-Cup Rectangle Glass Food Storage Container
6.9
Caraway
Caraway 14-Piece Glass Food Storage Container Set
9.7
Snapware
Snapware Total Solution Glass Food Storage Containers (18-Piece Set)
6.9
