Pre-sliced bread sometimes doesn't fit into toasters because of the size and shape of the slices. The standard size for pre-sliced bread slices is designed to be convenient for making sandwiches and general use but may not be an ideal fit for all types of toasters.
There are a few reasons why pre-sliced bread may not fit into toasters:
Thickness: Some toasters have narrower slots, and pre-sliced bread slices can be thicker, especially if they are from artisanal or thick-cut bread loaves. The thickness might exceed the slot width, preventing the bread from fitting properly.
Length: The length of pre-sliced bread might not match the length of the toaster slots, which can be a problem if the bread sticks out of the toaster or gets lodged inside without toasting evenly.
Shape: Some toasters have slots with curved edges or irregular shapes to accommodate different types of bread, such as bagels or English muffins. Pre-sliced bread may not fit well into these non-standard slots.
Width: In some cases, the width of pre-sliced bread might be too large for the toaster slots, causing the slices to get stuck or not fit at all.
Variations between brands: Different toaster brands have various slot sizes and configurations, so while pre-sliced bread might fit well in one toaster, it might not fit in another due to slight differences in design.
To overcome this issue, some toaster manufacturers produce models with wider slots or even "bagel settings" that allow for thicker slices or bagels to fit comfortably. Additionally, some toasters come with adjustable slots to accommodate various bread sizes and shapes. However, if you encounter a toaster that doesn't fit pre-sliced bread well, you can always resort to using a toaster oven, which tends to have more flexible space and can accommodate different bread sizes more easily.