The Osprey Skarab 18 (for people over 5-foot-8) and the slightly smaller Osprey Skimmer 16 (for people under 5-foot-8) are our picks for moderate-length, half-day hikes. They combine good hydration capacity (2.5 liter) with a relatively spacious, comfortable, simple pack, all at an affordable price. Even when this bladder was full, we were able to easily fit an insulating layer, shell, hat, gloves, first-aid kit, and lunch into the packs. We found the Skimmer’s and Skarab’s water bladders (manufactured by HydraPak, a leading maker of reservoirs for various companies) to be the best of the bunch. Are the “men’s” Skarab and “women’s” Skimmer packs much different?