, ▁Australia , ▁an ▁upper ▁bound ▁for ▁this ▁version ▁of ▁the ▁te ab ag ▁problem ▁is ▁ 0 . 2 1 7 + , ▁and ▁he ▁has ▁made ▁a ▁construction ▁that ▁appears ▁to ▁give ▁a ▁volume ▁of ▁ 0 . 2 0 5 5 + . ▁ ▁In ▁the ▁article ▁referred ▁to ▁above ▁A ▁C ▁ ▁Robin ▁also ▁found ▁a ▁more ▁complicated ▁formula ▁for ▁the ▁general ▁paper ▁bag . ▁Wh ilst ▁this ▁is ▁beyond ▁the ▁scope ▁of ▁a ▁general ▁work , ▁it ▁is ▁of ▁interest ▁to ▁note ▁that ▁for ▁the ▁tea ▁bag ▁case ▁this ▁formula ▁gives ▁ 0 . 2 0 1 7 , ▁unfortunately ▁not ▁within ▁the ▁bounds ▁given ▁by ▁Ke pert ▁( i . e ., ▁ 0 . 2 0 5 5 + ▁ ≤ ▁maximum ▁volume ▁ ≤ ▁ 0 . 2 1 7 + ). ▁ ▁See ▁also ▁▁ ▁B isc orn u , ▁a ▁shape ▁formed ▁by ▁att aching ▁two ▁squares ▁in ▁a ▁different ▁way , ▁with ▁the ▁corner ▁of ▁one ▁at ▁the ▁mid point ▁of ▁the ▁other ▁ ▁My lar ▁bal lo on ▁( geometry ) ▁ ▁References ▁ ▁External ▁links ▁▁ ▁The ▁original ▁statement ▁of ▁the ▁te ab ag ▁problem ▁ ▁Andrew ▁Ke pert ' s ▁work ▁on ▁the ▁te ab ag ▁problem ▁( mir ror ) ▁ ▁Cur ved ▁fol ds ▁for ▁the ▁te ab ag ▁problem ▁ ▁A ▁numerical ▁approach ▁to ▁the ▁te ab ag ▁problem ▁by ▁Andreas ▁G amm el ▁▁▁ ▁Category : Ge ometric ▁shapes ▁Category : Math emat ical ▁optimization