Regarding the covers, only one tip: buy !!! As canonist, I always regret - like everyone else - that we should buy the L series lenses for Canon Môssieur deign to provide cover ... Well, either we do not remake the world! Having a sacred range of objectives, including two L with cover thus q Tokina and Tamron (which are less stingy, THEM, follow my eyes!) I do not burden myself still like a big bag when I do not put a single pebble. So I made this purchase, receipt, unpacked and tested immediately that day. Conclusions: that happiness! Covers that the solid air with nylon straps, purse closed by a cord with stop spring and a small plastic hook for hanging all at a belt ring. Only this hook looks a bit light but there entirely made way to replace it with a metal hook bought cheaply in any DIY store.
4 different sizes, the largest allows me to cram a 75-300 zoom without any worry ... all for 13 euros, that want more and better to protect your equipment?