10000mah power bank to keep my phone charged on trips. And a waterproof box to store it in.
What waterproof box did you get?
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No problem. I've got one of those power banks but could do with a waterproof box for it like you. Keep forgetting though until I'm off out with it!
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double zip lock bag, that way you can put whatever device your charging into it too
i have some that i got from ikea, they are great, ive put near boiling chilli in them and carted it about and they havent split/broken. i guess if you got a box big enough then it wouldnt matter but its wasted space when your not charging