Add energy gel and/or fluid to almost anything. The SnapGel Module holds 4+ gels, is lighter than fabric gel flask carriers and locks in any direction horizontal or vertical to 1-2 inch strap. For AirFlow, RunLite, hydration or other packs, straps, belts, etc. Wide mouth cap and high-flow spout for easy filling, use and cleaning. 4 ounce capacity. BPA free. One module.