All of the Nestable Plastic Pallets and Nestable Presswood Pallets are considered open-bottom. The following models are also considered open-bottom pallets: 1) CPP220ACM, CPP333 ACM, CPP336 ACM, and CPP533ACM Plastic Pallets (2-Sides)* 2) 40 x 40 Dairy Pallet (4802101) (2-Sides) 3) POP Display Pallets – 24 x 48 (2-Sides), 40 x 48 (4-Sides), and 48 x 48 (4-Sides)* 4) EL-12406 EZ Lock Platform Pallet (2-Sides) 5) 800 x 1200 Smooth Top Euro Pallet (2-Sides) 6) PNH2001 Smooth Top Kit Bin Pallets – YL, BL, GN, and standard Gray. (2-Sides) 7) P4840S00 Solid Top Plastic Pallet (4-Sides) * Either 2 or 4 fork entry points of the described pallets are considered to be open bottom.