Very easy to fill if you use a squeeze bottle (allow to cool at least 10 minutes)
2 ML size gummy - need 3 trays for 1/2 recipe (about 8 oz) above: or 6 oz (180 ML) for 2 trays...
Better mousetrap? Other than the handle, I guess I don't see the benefit. A person could put a handle on with a thermos grip.
https://amazon.com/s?k=thermos+handle+grip&crid=3OS7B255T8LTJ&sprefix=thermos+handle%2Caps%2C284&ref=nb_sb_ss_ts-doa-p_4_14