After entering a conditional guilty plea, Tony Lawrence Gust appeals his judgment of conviction for possession of an unregistered firearm in violation of 26 U.S.C. § 5861(d). Pursuant to his plea agreement, Gust challenges the district court’s denials of his suppression motion and his renewed suppression motion, arguing that the district court erred in determining that he had no legitimate expectation of privacy in a locked container that the district court found was readily identifiable as a gun case based on its outward appearance. We have jurisdiction pursuant to 28 U.S.C. § 1291. We reverse the district court’s denials of Gust’s motion to suppress and *798 his renewed motion to suppress and remand for further proceedings consistent with this opinion.
I
On February 1, 2003, Officer Wade Hul-sizer of the Liberty Lake Police Department received a nonemergency call from a passerby who had observed individuals firing shotguns on private property located in a designated no-shooting zone. Officer Hulsizer drove to the scene of the reported shooting, and, upon hearing shots as he exited his patrol vehicle, called for law enforcement assistance.
Officer Hulsizer’s request was answered by Deputy Richard K. Johnson of the Spokane County Sheriffs Department. After Deputy Johnson arrived on the scene, he and Officer Hulsizer entered the property to investigate the shots. They encountered Gust walking with his girlfriend, Regina Lyons, and his friend, Brian Olsen. Gust and his companions were carrying cases that the officers testified they were readily able to identify as gun cases. 1 The officers detained Gust and his companions, and ran a warrant check that came back positive for Olsen and “unconfirmed” for Gust.
Gust informed the police that the trio had been engaged in target practice and that they had received permission to do so. Gust also told the police that the cases he and his companions were carrying contained guns. Officer Hulsizer searched the gun cases 2 and found the sawed-off shotgun that formed the basis for Gust’s prosecution and conviction for possession of an unregistered firearm in violation of 26 U.S.C. § 5861(d). 3
Gust made a pretrial motion to suppress the sawed-off shotgun and the statements he made after Officer Hulsizer discovered the gun, arguing that the police had violated his Fourth Amendment rights by searching his locked gun case without a *799 warrant. The government responded by arguing that the search was justified under both the “single-purpose container” and the exigent circumstances exceptions to the warrant requirement. The government further asserted that Gust had consented to the search.
The district court conducted a suppression hearing and then issued a written order denying Gust’s motion. Although the district court rejected the government’s contentions that the search of Gust’s gun case “was a consensual search or conducted under exigent circumstances,” it relied on
United States v. Huffhines,
Gust subsequently renewed his motion to suppress, which was denied after the district court held a second hearing. Gust then entered a conditional guilty plea reserving his right to appeal the district court’s denials of his motion to suppress and his renewed motion to suppress. This timely appeal followed.
II
A district court’s denial of a motion to suppress is reviewed de novo, while the factual findings underlying the denial of the motion are reviewed for clear error.
United States v. Bynum,
Clear error review is “significantly deferential, and we must accept the district court’s factual findings absent a definite and firm conviction that a mistake.has been committed.”
Leavitt v. Arave,
Ill
Gust contends that the district court erred in applying the “single-purpose container” exception to uphold the warrant-less search of his gun case because his case was “of such a nature that [it] could have contained any number of things,” not just a gun. We agree. 5
A
The “single-purpose container” exception to the warrant requirement originated in the United States Supreme Court’s decision in
Arkansas v. Sanders,
Not all containers and packages found by police during the course of a search will deserve the full protection of the Fourth Amendment. Thus, some containers (for example a kit of burglar tools or a gun case) by their very nature cannot support any reasonable expectation of privacy because their contents can be inferred from their outward appearance.
Id.
at 764 n. 13,
In Robbins v. California, a plurality of four justices elaborated on the “single-purpose container” exception, explaining that the exception is:
little more than another variation of the “plain view” exception, 7 since, if the distinctive configuration of a container proclaims its contents, the contents cannot fairly be said to have been removed from a searching officer’s view. The same would be true, of course, if the container were transparent, or otherwise clearly revealed its contents. In short, the negative implication of footnote 13 of the Sanders opinion is that, unless the container is such that its contents may be said to be in plain view, those contents are fully protected by the Fourth Amendment.
Applying these principles to the facts before them, the
Robbins
plurality held that the police could not rely on the footnote 13 exception to justify the warrantless search of packages described as “plastic wrapped green blocks” that were found in the defendant’s trunk.
Id.
at 428,
Expectations of privacy are established by general social norms, and to fall within the [single-purpose container] exception of [Sanders ] footnote [13] a container must so clearly announce its contents, whether by its distinctive configuration, its transparency, or otherwise, that its contents are obvious to an observer. If indeed a green plastic wrapping reliably indicates that a package could only contain marihuana, that fact was not shown by the evidence of record in this case.
Id.
at 428,
In
Miller,
we interpreted the
Robbins
plurality opinion to mean that courts should make judgments about the applicability of the “single-purpose container” exception by evaluating the nature of containers from the objective viewpoint of a layperson, rather than from the subjective viewpoint of a trained law enforcement officer, and without sole reliance on the specific circumstances in which the containers were discovered.
While it is difficult to evaluate the nature of a container without regard for the context in which it is found or the fact that the searching officer had special reasons to believe the container held contraband, we have previously decided that
Robbins
narrowed
Sanders
along these lines because otherwise the exception could swallow the warrant requirement; to apply
Sanders
footnote 13 without such restrictions could result in a rule that essentially permits law enforcement to conduct war-rantless searches of indistinct and innocuous containers based solely on probable cause derived from the officers’ subjective knowledge and the circumstances, in contravention of the well-established principle that “no amount of probable cause can justify a warrantless search or seizure absent ‘exigent circumstances,’ ”
Horton v. California,
Miller’s
reading of the
Robbins
plurality opinion to limit the weight a court may give to context and the subjective knowledge and expertise of searching officers when conducting a footnote 13 exception analysis also is proper in light of the manner in which the
Robbins
plurality applied
Sanders
to the facts of
Robbins.
In holding that the “plastic wrapped green blocks” were outside the scope of the
Sanders
exception, the plurality disregarded that the packages were found under
*803
circumstances that made it obvious that the packages contained drugs.
Robbins,
B
Applying these principles underlying the “single-purpose container” exception here, we hold that the district court erred in denying Gust’s motion to suppress. . The government argues that
Huffhines,
our most recent opinion addressing the “single-purpose container” exception, stands for the proposition that a person cannot have a legitimate expectation of privacy in containers that experienced officers can identify as gun cases. However, as explained above, we rejected that argument in
Miller,
11
where we made clear that courts should assess the nature of a container primarily “with reference to ‘general social norms’ ” rather than “solely ... by the experience and expertise of law enforcement officers.”
The government correctly notes that
Huffhines
upheld the warrantless search of an opaque plastic bag containing a handgun on the ground that “[tjhere can be no reasonable expectation of privacy in a container if its contents can be discerned from its outward appearance,”
Although our discussion of the “single-purpose container” exception in
Huffhines
was terse, we do not have to interpret it in a vacuum when other precedents like
Robbins
and
Miller
speak to the same issue. Thus, the government cannot rely.on the fact that Officer Hulsizer and Deputy Johnson were familiar with Gust’s gun case because they had. used similar cases during their work as police officers
12
to justify the warrantless search that occurred here.
See Miller,
Our analysis does not, however, end here. Even after we reject the government’s argument that the search of Gust’s gun case can be justified solely on the ground that the officers “recognized the plastic cases because they were exactly like the ones the Liberty Lake Police Department used,” the “clearly erroneous” standard of review requires us to affirm the district court’s finding that the cases were readily identifiable as gun cases if “the district court’s view of the evidence is plausible in light of the record viewed in its entirety.”
Rubera,
Our review of the record leads us to the conclusion that once one disregards the officers’ testimony regarding their experience with gun cases and the circumstances surrounding the search, the record is devoid of evidence to show that the case in dispute is one that is susceptible to ready identification by the general public as a gun case. In fact, the evidence in the record points to the contrary conclusion that a layperson would not be able to infer the contents of the case based on its outward appearance alone, and leads us to the “definite and firm conviction that a mistake has been committed,” even given the “significantly deferential” clear error standard of review.
Leavitt,
For example, there are photographs of the disputed case in the record, labeled as Defendant’s Exhibits 102-06 (Appendix A hereto). These photographs depict a nondescript, flat, rectangular case made of black plastic, bearing the mark “BUSHMASTER.” The case has a handle and hasps or fasteners along the opening side so that it can be secured with padlocks, and is virtually identical to some of the guitar cases pictured in Defendant’s Exhibit 113. 13 Also, at the first suppression hearing, Deputy Johnson testified that he “wouldn’t be able to say” what was in the gun case if one were “set ... in front of [him] today.”
The record does contain testimony from Gust’s girlfriend, Lyons, that cases such as the one in dispute are “what are commonly referred to as gun cases” and the “type of case [that] ordinarily houses a gun.” But, like the officers, Lyons was offering her opinion as a person “who has experience and knowledge” of gun cases. Moreover, her statements on their face are not unequivocal statements about the readily identifiable nature of the cases; Lyons is explaining that the cases are in fact the type of case commonly used for gun storage, not asserting that the cases are automatically recognizable to the general public as such. Finally, one cannot reasonably read Lyons’ above statements as support for the proposition that the case in dispute is a container of such a nature that its contents can be readily inferred from its outward appearance when Lyons also testified that such cases “could hold other things” and that she would not “be able to tell [what was in the case] without opening it.” 14
We hold that the district court erred in finding that the case in dispute is identifi
*805
able as a gun case based on its outward appearance alone, and in applying the “single-purpose container” exception to uphold the warrantless search of the case. Given that the district court had also ruled that the government could not justify the search based on consent or the exigent circumstances exception, Gust was entitled' to have the sawed-off shotgun from the case and his post-search statements suppressed. “Because [Gust] entered a conditional guilty plea, we are required to remand and allow him to withdraw his plea if he elects to do so.”
United States v. Grubbs,
REVERSED and REMANDED.
*806 APPENDIX A
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*807 [[Image here]]
*808 [[Image here]]
*809 [[Image here]]
*810 [[Image here]]
*811 APPENDIX B
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*812 [[Image here]]
*813 [[Image here]]
*814 [[Image here]]
Notes
. There are factual disputes as to whether there were two or three cases, and whether one of the cases was cloth or plastic. However, it is unnecessary for us to consider these disputes because there is no question that the case containing the sawed-off shotgun was the plastic Bushmaster case pictured in Defendant's Exhibits 102-06, appended hereto in Appendix A.
. There is also a factual dispute as to whether Officer Hulsizer conducted the search with Gust’s consent, but it is unnecessary for us to evaluate this dispute because the government did not argue consent as a basis for the search on appeal. Rather, the government sought to justify the search solely on the ground that the contents of the case containing the sawed-off shotgun were readily discernible based on the case's outward appearance.
. 26 U.S.C. § 5861(d) provides that: "It shall be unlawful for any person ... to receive or possess a firearm which is not registered to him in the National Firearms Registration and Transfer record.... ”
For the purposes of this code section, a "firearm” is defined as:
(1) a shotgun having a barrel or barrels of less than 18 inches in length; (2) a weapon made from a shotgun if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 18 inches in length; (3) a rifle having a barrel or barrels of less than 16 inches in length; (4) a weapon made from a rifle if such weapon as modified has an overall length of less than 26 inches or a barrel or barrels of less than 16 inches in length; (5) any other weapon, as defined in subsection (e); (6) a machinegun; (7) any silencer (as defined in section 921 of title 18, United States Code); and (8) a destructive device. The term "firearm" shall not include an antique firearm or any device (other than a machinegun or destructive device) which, although designed as a weapon, the Secretary finds by reason of the date of its manufacture, value, design, and other characteristics is primarily a collector’s item and is not likely to be used as a weapon.
26 U.S.C. § 5845(a).
. At the first hearing, the district court orally stated that: “There is no question [the cases Gust and his companions were carrying, including the one containing the sawed-off shotgun] were gun cases. I am absolutely satisfied that they were gun cases. Any of us would recognize those are gun cases, and the officers certainly recognized those were gun cases.”
. Because we reverse the district court’s denial of Gust's suppression motion on the ground that the district court erroneously applied the "single-purpose container” exception, we need not address Gust’s alternative contention.
. Although the Court overruled the main holding of
Sanders
in
Acevedo
by deciding that "[t]he police may search an automobile and the containers within it where they have probable cause to believe contraband or evidence is contained,”
. Courts have extended the
Sanders
footnote 13 exception beyond the classic "plain view once removed” scenario to cover "plain touch” cases,
see, e.g., United States v. Portillo,
.
Ross
overruled the' "precise holding” of
Robbins
that "the police may not conduct a warrantless search of a closed, opaque container found in a car even if they discover the container during a lawful search of the car,” but we have since determined that we “may still properly rely upon the
Robbins
plurality’s interpretation of footnote 13 of the
Sanders
opinion” because
"Ross
reversed
Robbins
on entirely different grounds relating to searches in the limited context of automobile searches and seizures.”
United States v. Miller,
.
Cf. Kyllo v. United States,
. We are not alone in our construction of
Sanders
footnote 13 to reflect its narrow scope.
See e.g., United States v. Bonitz,
. In
Miller,
the government "argue[d, as it does in the instant case,] that the contents of the [opaque] plastic bag [found to contain a fiberglass container of cocaine] were obvious to [the searching agent] because of ... [the ' agent's] considerable experience and expertise in drug enforcement.”
. The officers testified at the suppression hearings that they recognized the plastic cases in dispute as standard gun cases because they were the same type of cases the police department used. For example, Officer Hulsizer testified at the first suppression hearing that the cases in dispute were ones "that [he] recognized from [his] work on the force as the type of cases that [the Liberty police department] used to contain semiautomatic weapons.” Deputy Johnson testified that he recognized the cases as "standard gun cases” because "a standard to me is they are basically the same ones we use in our department.”
. Exhibit 113 is appended hereto in Appendix B.
. We express no opinion whether Gust's pre-search admissions to the police that the cases contained guns should be relevant to determining whether Gust retained any expectation of privacy in the gun case, as neither party raised this issue on appeal.
