Collapsible and compact, you can just about take the Katadyn BeFree Collapsible Water Filter Bottle 3 Liter everywhere on your outdoor adventures. 

• Easy to use: fill and hang the ultra-durable HydraPak 3L reservoir using the integrated Bail Handle & Carry Loop; filters up to an impressive 2 liters per min.
• Easy to clean: simply shake or swish the EZ-Clean Membrane to remove debris
• Collapsible 3-liter reservoir packs down small
• 0.1-micron microfilter is tested to protect against harmful organisms, removing protozoa (99.99%) and bacteria (99.9999%) to EPA standards
• 43mm, wide-mouth opening makes for easy filling from any lake, river, stream or faucet
• Cap over the drink nozzle keeps dirt out
• Tested to 1,000 liters; individual results will depend on water quality
• BPA-free
• Dimensions: 15.2 x 9.1
• Weight: 3.5 oz.