Trainers

**Advice wanted...
**
I've got 60+ pairs of boxed trainers that I'm gonna store in my basement, I've got a full-on duhumidifier and I've bought loads of dessicant sachets to chuck in the boxes but I wanna stick each box in a ziplok/freezer bag... Just to be super safe... Our place sits right above the RIver Effra...

Anyone know where I can get some really big ones that'll take a sneaker box?

I use these: www.amazon.co.uk/Russel-Vacuum-Storage-Bags-Gussets/dp/B000WCB9LU/ref=pd_cp_ce_0

You can get 3 boxes to a bag. Not the cheapest option but works well so far.