Two reams may both say "letter-size white paper" yet behave differently in printers, binders and student activities. Paper weight, brightness, opacity and coating affect how a sheet feels and how well it performs. A good purchasing specification records more than just size.
What does "20 lb" paper mean?
In common U.S. office-paper terminology, 20 lb bond is a familiar everyday copy-paper weight. The number comes from a basis-weight system tied to a category of paper and its original sheet size; it does not mean a ream weighs 20 pounds. An international measure, grams per square meter (gsm), is often easier to compare across paper types.
Typical 20 lb bond paper is roughly 75 gsm, but values vary by manufacturer. Do not compare "lb" numbers across cover stock, bond and other paper categories without checking the basis and gsm.
Brightness versus whiteness
Brightness generally relates to light reflectance measured under a defined test. It can influence perceived contrast of black text. Whiteness is a different property related to the visual appearance of the paper. Higher numbers are not automatically necessary for everyday attendance sheets or internal copies.
Opacity and show-through
Opacity helps determine whether print on one side is visible from the other. When double-sided printing, show-through can matter more than incremental differences in brightness. Test a representative sample if a school routinely uses duplex copying for dense text or graphics.
Finish and coatings
Uncoated multipurpose copy paper works for many everyday office tasks. Specialty photo, glossy, coated and cardstock media must be matched to the printing technology and weight limits. A laser printer's heat requirements differ from how an inkjet handles coatings and drying.
Compare paper using equivalent units
| Specification | Why it matters |
|---|---|
| Size | Tray, document and folder compatibility |
| Weight / gsm | Handling, feel and equipment feed limits |
| Brightness / opacity | Appearance and double-sided readability |
| Finish / coating | Printer technology and print results |
| Sheets per package | Usable unit cost and stock planning |
Standardize where it makes sense
Choose a compatible standard sheet for routine office use, then maintain separate approved options for color handouts, certificates or projects. Buying specialty paper for every printer may be unnecessary. Test it in the actual devices before creating a bulk order across campuses.
For sheet dimensions see our Standard Paper Sizes guide; for cartons and usage see School Copy Paper Buying Guide.