Going camping, hiking, or for a long bike ride? You're going to need a fair bit of water, but dealing with a hard, bulky water bottle can be a real drag. No problem. Check out this Evernew Collapsible Water Bottle ($11). When the bottle is empty, you can roll it up and wrap the cord around it so it's a compact little tube — perfect for packing into a small space. Not only does it shrink to almost nothing, it's BPA-free. I also love that the cap is attached so you don't have to worry about losing it.
The Evernew bottles come in a whole range of sizes from 600ml to 2000ml, so choose the one that best suits your needs. I say the bigger the better because once you're done with the water, you can roll it up, shove it in your bag or pocket, and forget about it. Order one from backpackinglight.com.