Designed to give you options! If you're on the move, simply fill your reservoir from your water source and this kit can be configured to use as an "in-line" filter inside your Drifter reservoir. Just connect the filter to the inside straw and lower into your reservoir.

or...

Use it in conjunction with the Transporter Water Bag. You'll be able to backfill your Drifter reservoir while on the road in hotel rooms, or on the trail without ever needing to remove it from your pack.