To do shelves
Offcuts
Sheeting that is bigger than 100*60 like caster 10mm EVA, cut the sheet when it arrives, you have 2 choices.
1 the obvious choice in half, and
2 the less obvious, is to cut one piece approx 900*600 so it fits nicely into the shelf leaving an off cut that will get used up within the week.
This avoids having 2 pieces floating around for ages.
Spare units soles