Bags carry two numbers and people conflate them. The size number sets the length and width of the band, and the weight on the bag tells you how much rubber is in it, so a bag of large bands contains far fewer than the same weight of small ones. Work out which size the job needs, then buy the weight that matches your turnover. See 25g bags, 500g bags and paper clips.

Rubber bands on a mailroom sorting bench with bundled envelopes and office trays.
Rubber Bands for Office Organisation

Shop rubber bands for bundling documents, packaging, stationery, cables and everyday office organisation.