Lowe alpine lightflite hydro backpack firecracker description for those who need to move fast in the mountains the lightflite hydro is our unique beltpackbottle carrier combo for mountain marathons trail runs or fast and light blasts in the mountains this beltpack combines simplicity with function giving you just enough space for those bare essentials we have designed the bottle pocket at an angle making it easier to access from your waist and with a generous amount of pocket s