Not sure. I've read that anything sewn can never be 100% waterproof, because by nature youre putting a 'shitton' of holes into it (technical term). If you don't have much experience with sewing I wouldnt worry about waterproofing to start. I used a waterproof zip and waterproof fabric, but the seams are so badly done that it would fill with water pretty quickly. Getting even seams in corners is much more difficult than I anticipated
I suppose you'd have to have taped seams for it to be waterproof - maybe a duct tape lining would work? (if that's a good idea, i'm serious. if it's stupid, i'm joking).
Not sure. I've read that anything sewn can never be 100% waterproof, because by nature youre putting a 'shitton' of holes into it (technical term). If you don't have much experience with sewing I wouldnt worry about waterproofing to start. I used a waterproof zip and waterproof fabric, but the seams are so badly done that it would fill with water pretty quickly. Getting even seams in corners is much more difficult than I anticipated
TLDR: maybe