How do you guys store your filament?
I'm currently giving this a try:
It's not tupperware, it actually fits two 0.75kg reels whole and leaves room for plenty of loose filament rolls (i fit a kilo of gray unspooled PLA next to these comfortably and there's still room to spare). It's a box meant for storage / refrigeration of food. It's completely airtight and even comes with replaceable color ID tags you clip on the corner of the lid and the box. The only trouble is - they're damned expensive (cca $16 a piece).
Oh, and if you've been wondering where to get all that desiccant... The answer is - in a pet store. They sell silica gel in 3, 6 and 9 liter bags, repurposed as cat litter. It's pure silica gel, no sand or anything mixed in. Something like $5-10 for 3+ liters.
Edit: it's liters, not kilos.