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This device can hold up to 200 units of insulin in it's cartridge. I'm not familiar with it to say if it has any safety interlocks to administer some sort of max dose lower than that at a time though.

There is a user setting for maximum bolus. For me I have it set to 30, but some may set it lower. Indeed that might be recommended after this.

Yea, you should never run the device without a max bolus set. Even 30 to me seems high, but insulin update can be wildly random between people.

Yes.

A typical pump will contain enough for several days. My pump right now has 100 units and is only half full.

Yes, actually much worse.

The Omnipod 5 uses pods that the user fills with their insulin, the minimum fill amount is 85 units, the maximum is 200 units (i.e. 0.85ml minimum, up to 2mL of U100 insulin).