FEFCO 0422 One-piece tray, double end walls with locking tabs

Length Width Height Thickness

Nib Lock tab Nicks

12×12 mat — 10.15″ × 6.00″

Each end wall folds up and then back down inside itself, standing two layers thick and trapping the flaps that carry the side walls round the corner. Tabs on the folded edge push through slots in the base and lock the tray open. The catalogue draws those flaps meeting in the middle and the tabs standing one board thickness proud; here they stop short of each other and the tabs follow the Nib slider, since neither survives at cardstock. FEFCO catalogue, p.51 ↗