A 6 oz continuous eco-spray of 30% DEET, pressurised with air rather than a chemical propellant.

The spray pattern is the advantage. A pump spray puts out a stream you have to work around; a continuous spray gives even coverage over arms and legs in one pass.

No propellant means nothing flammable and nothing to vent in a hot vehicle.

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

Six ounces covers a group for a long weekend.

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.