64 oz Insulated Water Bottle Starry Night - Half Gallon Flask

Our review of the Coolflask 64 oz insulated water bottle finds it best for anyone who needs a dependable, large-capacity bottle for long days away from a refill source. The single biggest reason to buy is the combination of a true half gallon capacity with proven vacuum insulation that keeps cold beverages chilled for hours; the bottle is both large enough to replace multiple smaller bottles and finished with a tactile, starry matte that resists slipping. For gym sessions, long commutes, or family outings this model balances capacity, insulation, and practical lid options.

Key Features

• Grand as the Galaxy finish: A matte gradient powder coat with ice speckles and a laser-engraved logo gives a textured, non-slip surface that resists sweating on wet palms.
• Vacuum insulated performance: Copper-plated double-wall stainless steel construction preserves cold for up to 48 hours and keeps hot drinks warm for up to 24 hours.
• Three-lid pack: Includes an easy-twist spout lid for large gulps, a flip-up straw lid for hands-free sipping, and a wide mouth handle lid for quick refills and adding ice.
• Food-grade safety: Made from 18/8 stainless steel and BPA-free materials to avoid odor retention and resist rust and corrosion.
• Large 64 oz capacity: Half gallon volume reduces the need to refill during long activities, making it suitable for all-day hydration.

Who It's For

Active people who need extended cold retention and a large single-container supply will appreciate this bottle: gym-goers, outdoor enthusiasts, parents managing hydration for kids, and commuters who dislike frequent refills. The textured finish helps during sweaty workouts and the three lids cover most drinking scenarios from quick gulps to hands-free sipping.

Those who prefer ultra-compact bottles, want dishwasher-safe convenience, or primarily carry carbonated soft drinks should look elsewhere, since the flask is a large half gallon meant for water and non-carbonated beverages and is recommended as hand wash only.

Pros & Cons

Pros

• Excellent ice retention, keeping beverages cold for many hours.
• Versatile 3-lid pack covers refill, sip, and gulp needs without extra purchases.
• Durable 18/8 stainless steel construction that is BPA-free and resists odor.
• Large 64 oz capacity reduces refills for long outings or full-day use.

Cons

• Strap and accessory durability received mixed feedback, with occasional reports of early wear.
• Hand wash only requirement and not suitable for carbonated drinks or freezer use.

Specifications

Capacity	64 oz (half gallon)
Material	18/8 food-grade stainless steel, copper-plated inner wall
Insulation	Double-wall vacuum, cold up to 48H, hot up to 24H
Lid options	Easy-twist spout lid, flip-up straw lid, wide mouth handle lid
Finish	Matte gradient powder coat with ice speckles and laser engraved logo
Care	Hand wash only; do not microwave or freeze

Our Verdict

The Coolflask 64 oz Starry Night is a strong choice for anyone who values a single large bottle that truly keeps drinks cold and offers practical lid versatility. It represents solid value for daylong hydration when handled with basic care, and is especially suitable for active households and outdoor use where refill opportunities are limited.

Frequently Asked Questions

How long does the bottle keep drinks cold?
Cold retention is up to 48 hours thanks to the copper-plated double-wall vacuum insulation.

Can I put ice and hot liquids in the bottle?
The wide mouth lid accepts ice; the bottle is rated to keep liquids hot up to 24 hours but be cautious of scalding when handling hot drinks.

Is this bottle dishwasher safe?
No, the bottle is hand wash only and should not be placed in a microwave or freezer.