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Four dark blue polypropylene binders with back-mounted metal rings

Business Source

Business Source 28551BD binder 1.50" 350 sheets Dark Blue 4 pack

SKU CH-DRK4-FC0FT MPN 28551BD

Four-pack of 1.50-inch round-ring binders holds 350 letter sheets each with internal 30-sheet pockets

  • Surface finishPolypropylene
  • Product typeBasic Binders
  • Key featuresBasic round-ring binder features two triggers on the ring me
  • Product colorDark Blue
  • Size details8.5 × 11 in
  • Pack quantity4 per pack
  • Holds up to 350 letter-size sheets with 1.50" round-ring capacity
  • Two trigger rings open easily for quick document access
  • Back-mounted metal rings keep pages lying flat on the desk
  • Internal clear pockets add 30-sheet storage per cover
  • Polypropylene cover with chipboard core resists daily wear
  • 4-pack supplies consistent filing across multiple projects

Dark Blue 1.50" binders for letter documents

This four-pack of Business Source 28551BD binders stores letter-size papers in a dark blue polypropylene cover. Each unit holds up to 350 sheets on three back-mounted metal rings so pages lie flat. Two triggers on the ring mechanism give quick access to the contents. The sturdy chipboard core and exposed rivets support daily office or school use.

Trigger rings and internal pockets simplify setup

Open the rings by pressing the two triggers, load the punched sheets, then snap the rings shut — no tools required. Clear pockets on the inside covers each accept up to 30 extra sheets for unpunched items. Because the rings are back-mounted, pages turn smoothly and stay aligned. The only common snag is overfilling beyond the rated capacity, which can strain the ring mechanism.

350-sheet capacity with 30-sheet pocket headroom

The 1.50" spine comfortably manages 350 letter-size pages plus 30 sheets in each internal pocket for reference material. Once the main rings reach 350 sheets the binder will not close cleanly and the triggers become stiff. Users who need more storage should move to a larger-capacity binder rather than force extra paper into this one.

How it compares

Measured against everything we stock in Ring Binders & Sheet Protectors, at today’s prices. Recalculated every night.

Price $23.99
Pricier than about 70% of the 984 comparable items (median $16.49).

Specifications

Product
Brand nameBusiness Source
Model name28551BD
Product typeBasic Binders
Product colorDark Blue
Size & build
Surface finishPolypropylene
Size details8.5 × 11 in
Shipping weight2.04 kg
Package size330 × 267 × 127 mm
In the box
Pack quantity4 per pack

Questions about this item

How can I tell the rings are operating correctly after I load the binder?

Open and close each ring using the two triggers; they should snap shut cleanly and the back-mounted metal rings must let the 350 letter-size sheets lie flat without catching.

What comes in the package and is anything else required?

The box contains four dark-blue polypropylene binders with 1.50-inch round rings, internal clear pockets holding 30 sheets each, and exposed rivets on a chipboard core; no extra parts are needed.

Which capacity version should I choose for standard letter documents?

This 28551BD model provides 1.50-inch rings holding 350 letter-size sheets, so select it when you need that exact capacity.

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