When it comes to finding paper for strength then we think of cardboard sheets or even chipboards that are as useful for crafts as for packaging.
Pyrotechnics, by Brock, A St. H.—A Project Gutenberg eBook
Chipboard Sheets 8.5 x 11 - 100 Sheets at 22 Point
2 Sheets Brown Chipboard 100 Point Extra Thick 11 X 17 Inches
Cover weight 65#. GSM weight 176. Caliper thickness .010. Metric .254mm Colored with darker and lighter tones. Laser and ink jet printable.
150 Bright White Smooth 80#Card Paper Sheets - 4 x 6 (4x6 Inches) photo|card|frame Size - 80 lb/pound Cover Weight - Quality Stock - Print
Chipboard Sheets 8.5 x 11 - 100 Sheets at 22 Point
Use as book board, binder's board, backer board, paper board, chipboard pads and much more Ideal thin chipboard sheets for making albums, frames,
Chipboard Sheets 8.5 x 11 - 100 Sheets of 22 Point Chip Board for Crafts - This Kraft Board is a Great Alternative to MDF Board and Cardboard Sheets
Printing Paper In A Variety Of Sizes And Thickness – ThunderBolt Paper
Printing Paper In A Variety Of Sizes And Thickness – ThunderBolt Paper
Grafix Medium Weight Acid-Free 0.057” Chipboard Sheets