400 Packs 3.5x4.5 in Corrugated Cardboard Sheets - Rigid Lightweight

In this review of the 400 packs 3.5x4.5 in corrugated cardboard sheets, the bottom line is simple: these pads are an affordable, lightweight way to keep small flat items from bending in transit. The reviewer found them especially useful for card collectors, small sellers and crafters who need a no-frills protective layer that does not add significant weight. The set delivers a large quantity at a low per-piece cost and the corrugated construction gives enough rigidity to protect postcards, trading cards and small prints without making packages heavy or expensive to ship.

Key Features

• Rigid yet lightweight: The corrugated construction provides firmness that resists bending while keeping each pad light so shipping costs stay low.
• Bulk quantity: A pack of 400 pieces supplies enough inserts for frequent shippers, small businesses or large craft projects without repeated reordering.
• Compact size: At 3.5 x 4.5 in each pad works well for standard trading cards, postcards and small prints as a simple backing or divider.
• 2mm thickness: The thin but sturdy profile adds protection without taking up much internal space in an envelope or small box.
• Neat packaging: Sheets are stacked and packed in a clear bag rather than strapped, reducing the chance of edge damage in transit.

Who It's For

This product is aimed at card collectors, online sellers and crafters who frequently ship small flat items and want an inexpensive way to prevent creasing and corner damage. Because you get 400 pieces, it is particularly useful for small businesses and high-volume shippers who need consistent, disposable protection.

Those who need large-format backing, extra-thick board or pre-cut bespoke shapes should look elsewhere; these pads are best for light to moderate protection of small items, not heavy-duty structural packing or oversized prints.

Pros & Cons

Pros

• Provides reliable card protection during shipping without adding much weight.
• Great value for money with 400 pieces in a single set.
• Neatly packed in a clear bag to avoid edge damage from binding or strapping.

Cons

• At 2mm thickness these pads are not a substitute for heavy backing board when maximum rigidity is required.

Specifications

Product type	Corrugated cardboard pads
Quantity	400 pieces
Dimensions	3.5 x 4.5 in
Thickness	2mm
Color	Premium brown
Packing	Stacked and sealed in a clear bag

Our Verdict

These corrugated pads are a practical, cost-effective choice for anyone shipping trading cards, small prints or other thin flat items that need protection from bending. The 400-count and lightweight 2mm construction make them excellent value for frequent shippers and small businesses, while the neat packaging reduces damage on arrival. They are not intended as a heavy-duty backing replacement, but for everyday card protection they deliver consistent results.

Frequently Asked Questions

Are these suitable for trading cards?
Yes, the 3.5 x 4.5 in size and corrugated rigidity make them well suited as a backing for trading cards during shipping.

How thick are the pads?
Each pad is approximately 2mm thick, offering light to moderate protection without bulk.

How are they packaged?
The sheets are stacked neatly and packed in a clear bag rather than bound with straps to avoid edge damage.