Flow Formulas Reusable Gel Flask. Features: An easy way to carry bulk gel and eliminate sticky packs Features a bite valve for easy use on the go Simply scoop in gel mix, add water, shake, and its race ready 150 ml flask can hold up to two gels - best for mixing and racing 250 ml flask can hold up to four gels - best for long days in the saddle BPA free Specs: Model:Reusable Gel Flask, 150ml Description:Flask for Bulk Gel Package:Each