When space is tight and bulk is bad, consider the Nalgene 10 oz. Flask. Like its namesake, the Flask's slender, lightweight design makes it ideal for pockets, handbags, and chest waders. It's leakproof, too, so you can have peace of mind when not in use.

• 10 oz. volume
• BPA, BS and Phthalate Free
• Fits easily into bags and packs
• Includes durable insulation sleeve
• No plastic taste or odor