Wall Thickness and Cold Retention Explained
How polystyrene box wall thickness affects cold retention time — what 25 mm, 35 mm and 50 mm walls mean for your shipment and when thicker matters.
The buyer's guide to polystyrene boxes
Straight answers to the questions you have before you order: what internal size actually means, how wall thickness affects hold time, and which boxes fit courier limits.
Guides
Wall thickness, drain holes, courier limits and disposal, each covered on its own page.
Internal vs External Dimensions — Why the Inside Measurement Matters
Internal dimensions tell you what fits inside your polystyrene box. External dimensions tell the courier what it costs. Here is how to read and use both.
Courier Parcel Size Limits for Polystyrene Boxes
Which polystyrene boxes fit within standard UK courier parcel size limits — and what to check before you book a collection.
Polystyrene Box Lid Types — Drop-On, Clip-On and Telescopic
The difference between drop-on, clip-on and telescopic polystyrene box lids — which seal tighter, which stack better, and which your application needs.
Drain Holes, Ice Packs and Dry Ice — Keeping Contents Cold in Transit
When your polystyrene box needs drain holes, how to choose between gel ice packs and dry ice, and how each affects the box you should order.
Disposing of Used Polystyrene Boxes Responsibly
How to dispose of or recycle used EPS polystyrene boxes in the UK — local council collection, compacting, specialist recyclers and reuse options.