Is the Hamilton Small big enough for everyday use?

It holds a phone, wallet, keys and a few small items. At 10 by 7.5 by 4.75 inches it will not fit a tablet or laptop, so it suits light everyday carry rather than work commutes with devices.

Does it come with a crossbody strap?

Yes. It has a top handle and a detachable strap, so it can be carried by hand or worn crossbody.

The listing gives a maximum compatible device size of 7 inches, so a standard phone fits. Internal pockets hold cards and small items; larger wallets and pouches take up most of the space.

The listing specifies leather for the body and outer material. Michael Kors uses leather on this line, with some trim and lining in other materials.

How does it compare with the larger Hamilton satchel?

This is the small version. The larger Hamilton carries more and fits a tablet, but it is heavier and bulkier for crossbody wear. Choose the small for evenings and light days, the larger for work.