The Big Zip™ SL reservoir is the most finely-tuned hydration reservoir made. Nothing makes staying hydrated easier and, at the end of the day, that means a better day.
| 1.8 LTR | 2.0 LTR | 3.0 LTR | |
| Capacity | 60 fl. oz / 1.8 liters | 70 fl. oz / 2 liters | 100 fl. oz / 3 liters |
| Color | |||
| Weight | 5.5 oz / 154 g | 5.5 oz / 157 g | 5.8 oz / 165 g |
| Width | 7.25 in / 18.5 cm | 7 in / 18 cm | 7.75 in / 19.5 cm |
| Length | 14.75 in / 37.5 cm | 18.5 in / 47 cm | 18.75 in / 47.5 cm |
| Material(s) | |||
| Film | Polyurethane / Polyethylene | Polyurethane / Polyethylene | Polyurethane / Polyethylene |
| Zip material | Ethylene Vinyl Acetate / Linear Low Density Polyethylene | Ethylene Vinyl Acetate / Linear Low Density Polyethylene | Ethylene Vinyl Acetate / Linear Low Density Polyethylene |
| Hose port material | Acetal / Polyethylene | Acetal / Polyethylene | Acetal / Polyethylene |
| Drink tube material | Polyurethane | Polyurethane | Polyurethane |
| Bite valve material | Silicone | Silicone | Silicone |
| SOV material | Polypropylene / High Density Polyethylene | Polypropylene / High Density Polyethylene | Polypropylene / High Density Polyethylene |
| Country of Origin | Made in Seattle, USA | Made in Seattle, USA | Made in Seattle, USA |

Platypus awarded Best Hydration System Brand as voted by readers of Dandelion Magazine (now Women’s Adventure Magazine) in 2005.