A 3.4 oz pump spray of 30% DEET insect repellent.

The everyday size — enough for a weekend for two people, small enough to live in a pack.

Higher concentration does not repel harder, it repels longer. 30% covers an evening comfortably; 100% is for all-day exposure or genuinely bad conditions.

Pump spray, no propellant. Safe in a hot truck, legal to fly with.

One warning worth knowing: DEET attacks plastics and synthetics. It will haze a watch crystal, cloud sunglasses, soften a rain jacket's coating and weaken fishing line. Spray it on your hands away from your gear, and wash your hands before you handle anything you care about.