These 50 sheets of tissues paper weigh10.4 ounces, or 0.2 ounces per single sheet. These 30 6″ by 9″ envelopes altogether weigh 7.85 ounces, which is 0.262 ounces each.

  This stack of 8,  4″ coasters weighs 2.0 ounces.  Thus, each weighs 0.25 ounces.