MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.
You're thinking of it wrong. The standing on end print hs the layers in a fine position. https://i.imgur.com/TklvpoE.png
the force from the heavy bag will not be edge on all the layers, and the layers will, in turn, be on your hand. Sure, the layers aren't in compression, the best way where layer adhesion is entirely irrelevant, but the force will instead be along a series of slanted permit rings.
Because the bag handle applies this weight across the entire handle, layer adhesion is once again not relevant, as the layers aren't under any shear force, the perimeters are just in compression, between the bag and your hand. Any minor shear force is easily handling though, as the layers are slanted.