I use this one to protect the Mavic, and then toss it in a messenger bag or whatever I take with me for the day. It is a bit on the small side so you cannot close the pouch, but I only use it for the padding.
I have used these on motorcycle adventure trips. 10 hours in the rain, biked dropped in the river and everything in side perfectly dry. They are also for lifetime, mine are 10yrs old and still look new.
good review and a dip test I did.
I have the 10L, but sure the 5L would do for the mavic
5l bag size 300mm(H) x 160mm(W) x 100mm(D)
Mavic size H198mm x W83mm x L83m