Does it keep drinks cold all day?

The double-wall vacuum insulation is rated for up to 6 hours, not a full day. Expect cold drinks through a morning or a commute, and hot drinks to stay warm for a similar stretch.

Can it hold a standard can?

Yes. The included insulator ring seats a standard 12 oz can or bottle in the tumbler so your hand stays off the cold metal.

Is it dishwasher safe?

No. It is hand wash only, so wash the body and lids by hand to protect the vacuum seal and the plastic lids.

Will the lid leak in a bag?

The clear lid is a push-on type with a sliding opening, not a screw-on leakproof lid. Carry it upright and don't toss it in a bag with liquids inside.

What comes in the box?

The tumbler, a clear plastic push-on lid with a sliding drink opening, and the can and bottle insulator ring.

Is it good for hot coffee?

Yes, it holds heat for up to 6 hours, but the push-on lid is not sealed, so it is better for sipping at a desk or in a car than for a commute in a bag.