A frame for an understairs storage system for under a stairs, the system having a plurality of substantially triangular gussets, each gusset having a gusset pitch α, the frame comprising: a first support member and a second support member , each of the first and second support members having a plurality of preconfigured engagement points , the preconfigured engagement points of the first support member pairing with the plurality of preconfigured engagement points of the second support member to provide a plurality of pairs of engagement points; each pair of engagement points of the plurality of pairs of engagement points configured to cooperably engage a gusset of the plurality of gussets, at a convergent point of the first and second support members to orientate the second support member at a preselected angle, x, to the first support member , said preselected angle corresponding to the gusset pitch α wherein the gusset pitch matches a pitch of the stairs and wherein the first support member has a longitudinal length and wherein the first plurality of pre-configured engagement points are positioned at a distal end of the longitudinal length at a distance from a proximate end of the first support member the distance in millimetres being 32α - Y, α being the gusset pitch and Y being a constant; and wherein the second support member has a longitudinal length and wherein the plurality of pre-configured engagement points of the second support member are positioned at a distal end of the longitudinal length at a distance from a proximate end of the second support member the distance in millimetres being 10.66α + Z, α being the gusset pitch and Z being a constant; and wherein Y has a value of from 390 to 400 and Z has a value of 210 to 220, or wherein Y has a value from 260 to 270 and Z has a value of from 310 to 320. a first support member and a second support member , each of the first and second support members having a plurality of preconfigured engagement points , the preconfigured engagement points of the first support member pairing with the plurality of preconfigured engagement points of the second support member to provide a plurality of pairs of engagement points; each pair of engagement points of the plurality of pairs of engagement points configured to cooperably engage a gusset of the plurality of gussets, at a convergent point of the first and second support members to orientate the second support member at a preselected angle, x, to the first support member , said preselected angle corresponding to the gusset pitch α wherein the gusset pitch matches a pitch of the stairs and wherein the first support member has a longitudinal length and wherein the first plurality of pre-configured engagement points are positioned at a distal end of the longitudinal length at a distance from a proximate end of the first support member the distance in millimetres being 32α - Y, α being the gusset pitch and Y being a constant; and wherein the second support member has a longitudinal length and wherein the plurality of pre-configured engagement points of the second support member are positioned at a distal end of the longitudinal length at a distance from a proximate end of the second support member the distance in millimetres being 10.66α + Z, α being the gusset pitch and Z being a constant; and <EOS>