Is the Nalgene Rectangular 64 oz bottle insulated?

No. It is a single-wall polyethylene bottle, so it does not keep water cold and will sweat in warm conditions. It is built for capacity and durability, not temperature retention.

Will it fit in a backpack side pocket?

Usually not. At 64 oz and rectangular, it is larger than most side pockets and is better carried inside the pack or strapped to the outside.

Can I put it in the dishwasher?

Nalgene bottles are generally dishwasher-safe on the top rack, though hand washing with a bottle brush is gentler on the plastic over time.

Does the wide mouth leak?

The screw cap seals well when tightened, but the wide opening pours quickly, so fill and drink carefully, especially in a moving vehicle.

Is the plastic BPA-free?

Nalgene's polyethylene bottles are made without BPA. Check the bottle's base marking to confirm the specific resin.

How does it compare with a round 32 oz Nalgene?

It holds twice the water and packs flatter, but it is heavier, bulkier and does not fit cup holders or bike cages the way the smaller round bottle does.