I got a large plastic box (15-20 gal size), with a lid, for my pet's BoB and 2 Pet Carriers.

I keep the following in the Pet's BoB:
20LBS-Kibbles and Bits
Medical records (their's)
Medications (their's)
1 tennis ball (the older dog's)
1 chew toy (the younger dog)
Doggie FAK (I found this @ my local Feed & Seed store)
2 food & 2 water bowls

I do have to add the following if their BoB is needed:
2 leashes (their's)
1 Stake Out Pin
2 Doggie Beds (their's)
More tennis balls (older dog)
More chew toys (younger dog)
Puppy Cow (younger dog, if he still eats it when BoB's needed)

I keep a big fluffy towel in each of the Pet Carriers

DEFICIENCIES:
I need to add a package of bed chucks

Note:
Nighttime sleeping arrangements are that the younger dog puts my DD1 (severely handicapped) to bed & sleeps with her (it's his job); The older dog sleeps with me and my DW.

I am looking for some packs that would fit the dogs, although they are small (Boston Terrier mixed breeds), they can carry some of their own gear.