I can't imagine anything larger than a 30 or 32 for carrying around. My 6x Katmai's pulled out a squirrel in a very brushy White Oak tree the other day...so often the Fox squirrels are masters at hiding....but my bino's always pull them out if they are there any hair at all exposed. Caused the demise of many this season alone. Definitely a deal breaker. Cat or Gray squirrels will often run whenever seen...not so with these Red Fox squirrels. The male's seem much more elusive, several I had hang up real tight were males, the bino's sealed the deal.
