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 (101, 102) having a plurality of preconfigured engagement points (301, 302), 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 (101, 102) 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 (101, 102) having a plurality of preconfigured engagement points (301, 302), 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 (101, 102) 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