Groupon has the High Sierra Wahoo Hydration Pack available in four colors, for $34.99 + FREE shipping!

Why this deal is hot:
Save 71% off -- that's $85.01 in savings!

What this does and why you need it:
This hydration pack carries 2-liters of liquid with a wide opening in the reservoir for easy filling. It also features an insulated hose cover to prevent freezing, is BPA-free, antimicrobial, includes space for gear and can hold a bike helmet. It also features a front pocket organizer, has lightweight shoulder straps, side compression straps and weighs 1.984lb. It measures 18.25" x 9.25" x 7" and has a 14 liter total capacity.