how to actually recycle the re-kanken?

i have had a re-kanken for about 8 years and used it on and off over that time, mostly while travelling studying. the fabric is very stained and there are some rips that my skills can't repair any better lol. a big selling point for me was that you can recycle it again at the end of its life - but i can't find anything online about how to actually physically get it recycled. it's mixed materials so i can't just put it in my kerbside recycling bin. help?