Case Study · 5 min read · October 2025
Case Study: Tropicfeel Cut Shipping CO₂ by 50% with a Pack Redesign
A travel-shoe brand redesigned a single mailer — zero void-fill, lower dim-weight, dramatically reduced transport emissions across global DTC.
When a DTC brand ships 200,000+ pairs of shoes a year across three continents, the mailer is the highest-leverage carbon decision they make. Tropicfeel's redesign hit a 50% CO₂e reduction without changing the product or shipper.
Where the emissions were hiding
An LCA on the legacy pack — branded shoebox + protective sleeve + LDPE mailer + paper void fill — showed transport accounted for 71% of total packaging CO₂e. The shoebox's 30% air gap drove dimensional-weight billing on every order.
Material substitutions (recycled board, paper void fill) had already been made. The next lever was geometry, not chemistry.
The new structure
We replaced the box-in-mailer system with a single die-cut corrugated mailer that wraps the shoe pair with zero void. A pre-creased return panel turns the same pack into the return envelope.
Pack weight dropped 38%, pack volume dropped 41%, and dimensional-weight billing dropped to actual weight on most courier zones.
Results
Per-pair shipping CO₂e fell from 0.62 kg to 0.31 kg — a 50% reduction. Unit cost fell 18%. Return rates were unchanged; review sentiment around 'unboxing' actually improved.
The single-pack system also shortened pick-and-pack time by 22 seconds per order — a meaningful lift at fulfilment-centre scale.