Backpack/daypack

[Tayls]

Another thought, remembering back to my last hunt. When you've got the back pack on your shoulders, the straps get in the way of bringing your rifle up quickly and comfortably into your shoulder. This is especially true for thick, strong shoulder straps. You might not have time to quickly and quietly remove the bag. In this instance a sling type bag over your non shooting shoulder may be better.

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I have learnt to simply push the shoulder strap to the side when taking a quick shot (this works for me).... plus a single sling pack is gonna hurt your shoulders after a full day's long, hard walk and stalk in the veld.

[Skaaphaas]

Have you tried rinsing it with something slightly acidic? Could be a metal or polysulfide precipitate

Shot. Will give it a try.

[beetlepower]

Miltons, which is designed for cleaning baby bottles, is great for cleaning Hydration bladders and fairly inexpensive